object does not support item assignment python

• TypeError: 'str' object does not support item assignment

Last updated: Apr 8, 2024 Reading time · 8 min

# Table of Contents

• TypeError: 'int' object does not support item assignment
• 'numpy.float64' object does not support item assignment

# TypeError: 'str' object does not support item assignment

The Python "TypeError: 'str' object does not support item assignment" occurs when we try to modify a character in a string.

Strings are immutable in Python, so we have to convert the string to a list, replace the list item and join the list elements into a string.

Here is an example of how the error occurs.

We tried to change a specific character of a string which caused the error.

Strings are immutable, so updating the string in place is not an option.

Instead, we have to create a new, updated string.

# Using str.replace() to get a new, updated string

One way to solve the error is to use the str.replace() method to get a new, updated string.

The str.replace() method returns a copy of the string with all occurrences of a substring replaced by the provided replacement.

The method takes the following parameters:

By default, the str.replace() method replaces all occurrences of the substring in the string.

If you only need to replace the first occurrence, set the count argument to 1 .

Setting the count argument to 1 means that only the first occurrence of the substring is replaced.

# Replacing a character with a conversion to list

One way to replace a character at a specific index in a string is to:

• Convert the string to a list.
• Update the list item at the specified index.
• Join the list items into a string.

We passed the string to the list() class to get a list containing the string's characters.

The last step is to join the list items into a string with an empty string separator.

The str.join() method takes an iterable as an argument and returns a string which is the concatenation of the strings in the iterable.

Python indexes are zero-based, so the first character in a string has an index of 0 , and the last character has an index of -1 or len(a_string) - 1 .

If you have to do this often, define a reusable function.

The update_str function takes a string, index and new characters as parameters and returns a new string with the character at the specified index updated.

An alternative approach is to use string slicing .

# Reassigning a string variable

If you need to reassign a string variable by adding characters to it, use the += operator.

The += operator is a shorthand for my_str = my_str + 'new' .

The code sample achieves the same result as using the longer form syntax.

# Using string slicing to get a new, updated string

Here is an example that replaces an underscore at a specific index with a space.

The first piece of the string we need is up to, but not including the character we want to replace.

The syntax for string slicing is a_string[start:stop:step] .

The start index is inclusive, whereas the stop index is exclusive (up to, but not including).

The slice my_str[0:idx] starts at index 0 and goes up to, but not including idx .

The next step is to use the addition + operator to add the replacement string (in our case - a space).

The last step is to concatenate the rest of the string.

Notice that we start the slice at index + 1 because we want to omit the character we are replacing.

We don't specify an end index after the colon, therefore the slice goes to the end of the string.

We simply construct a new string excluding the character at the specified index and providing a replacement string.

If you have to do this often define a reusable function.

The function takes a string, index and a replacement character as parameters and returns a new string with the character at the specified index replaced.

If you need to update multiple characters in the function, use the length of the replacement string when slicing.

The function takes one or more characters and uses the length of the replacement string to determine the start index for the second slice.

If the user passes a replacement string that contains 2 characters, then we omit 2 characters from the original string.

# TypeError: 'int' object does not support item assignment

The Python "TypeError: 'int' object does not support item assignment" occurs when we try to assign a value to an integer using square brackets.

To solve the error, correct the assignment or the accessor, as we can't mutate an integer value.

We tried to change the digit at index 0 of an integer which caused the error.

# Declaring a separate variable with a different name

If you meant to declare another integer, declare a separate variable with a different name.

# Changing an integer value in a list

Primitives like integers, floats and strings are immutable in Python.

If you meant to change an integer value in a list, use square brackets.

Python indexes are zero-based, so the first item in a list has an index of 0 , and the last item has an index of -1 or len(a_list) - 1 .

We used square brackets to change the value of the list element at index 0 .

# Updating a value in a two-dimensional list

If you have two-dimensional lists, you have to access the list item at the correct index when updating it.

We accessed the first nested list (index 0 ) and then updated the value of the first item in the nested list.

# Reassigning a list to an integer by mistake

Make sure you haven't declared a variable with the same name multiple times and you aren't reassigning a list to an integer somewhere by mistake.

We initially declared the variable and set it to a list, however, it later got set to an integer.

Trying to assign a value to an integer causes the error.

To solve the error, track down where the variable got assigned an integer and correct the assignment.

# Getting a new list by running a computation

If you need to get a new list by running a computation on each integer value of the original list, use a list comprehension .

The Python "TypeError: 'int' object does not support item assignment" is caused when we try to mutate the value of an int.

# Checking what type a variable stores

If you aren't sure what type a variable stores, use the built-in type() class.

The type class returns the type of an object.

The isinstance() function returns True if the passed-in object is an instance or a subclass of the passed-in class.

# 'numpy.float64' object does not support item assignment

The Python "TypeError: 'numpy.float64' object does not support item assignment" occurs when we try to assign a value to a NumPy float using square brackets.

To solve the error, correct the assignment or the accessor, as we can't mutate a floating-point number.

We tried to change the digit at index 0 of a NumPy float.

# Declaring multiple floating-point numbers

If you mean to declare another floating-point number, simply declare a separate variable with a different name.

# Floating-point numbers are immutable

Primitives such as floats, integers and strings are immutable in Python.

If you need to update a value in an array of floating-point numbers, use square brackets.

We changed the value of the array element at index 0 .

# Reassigning a variable to a NumPy float by mistake

Make sure you haven't declared a variable with the same name multiple times and you aren't reassigning a list to a float somewhere by mistake.

We initially set the variable to a NumPy array but later reassigned it to a floating-point number.

Trying to update a digit in a float causes the error.

# When working with two-dimensional arrays

If you have a two-dimensional array, access the array element at the correct index when updating it.

We accessed the first nested array (index 0 ) and then updated the value of the first item in the nested array.

The Python "TypeError: 'float' object does not support item assignment" is caused when we try to mutate the value of a float.

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Fix Python TypeError: 'str' object does not support item assignment

This error occurs because a string in Python is immutable, meaning you can’t change its value after it has been defined.

Another way you can modify a string is to use the string slicing and concatenation method.

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Tuple Object Does Not Support Item Assignment. Why?

Have you ever seen the error “tuple object does not support item assignment” when working with tuples in Python? In this article we will learn why this error occurs and how to solve it.

The error “tuple object does not support item assignment” is raised in Python when you try to modify an element of a tuple. This error occurs because tuples are immutable data types. It’s possible to avoid this error by converting tuples to lists or by using the tuple slicing operator.

Let’s go through few examples that will show you in which circumstances this error occurs and what to do about it.

Let’s get started!

Explanation of the Error “Tuple Object Does Not Support Item Assignment”

Define a tuple called cities as shown below:

If you had a list you would be able to update any elements in the list .

But, here is what happens if we try to update one element of a tuple:

Tuples are immutable and that’s why we see this error.

There is a workaround to this, we can:

• Convert the tuple into a list.
• Update any elements in the list.
• Convert the final list back to a tuple.

To convert the tuple into a list we will use the list() function :

Now, let’s update the element at index 1 in the same way we have tried to do before with the tuple:

You can see that the second element of the list has been updated.

Finally, let’s convert the list back to a tuple using the tuple() function :

Makes sense?

Avoid the “Tuple Object Does Not Support Item Assignment” Error with Slicing

The slicing operator also allows to avoid this error.

Let’s see how we can use slicing to create a tuple from our original tuple where only one element is updated.

We will use the following tuple and we will update the value of the element at index 2 to ‘Rome’.

Here is the result we want:

We can use slicing and concatenate the first two elements of the original tuple, the new value and the last two elements of the original tuple.

Here is the generic syntax of the slicing operator (in this case applied to a tuple).

This takes a slice of the tuple including the element at index n and excluding the element at index m .

Firstly, let’s see how to print the first two and last two elements of the tuple using slicing…

First two elements

We can also omit the first zero considering that the slice starts from the beginning of the tuple.

Last two elements

Notice that we have omitted index m considering that the slice includes up to the last element of the tuple.

Now we can create the new tuple starting from the original one using the following code:

(‘Rome’,) is a tuple with one element of type string.

Does “Tuple Object Does Not Support Item Assignment” Apply to a List inside a Tuple?

Let’s see what happens when one of the elements of a tuple is a list.

If we try to update the second element of the tuple we get the expected error:

If we try to assign a new list to the third element…

…once again we get back the error “‘ tuple’ object does not support item assignment “.

But if we append another number to the list inside the tuple, here is what happens:

The Python interpreter doesn’t raise any exceptions because the list is a mutable data type.

This concept is important for you to know when you work with data types in Python:

In Python, lists are mutable and tuples are immutable.

How to Solve This Error with a List of Tuples

Do we see this error also with a list of tuples?

Let’s say we have a list of tuples that is used in a game to store name and score for each user:

The user John has gained additional points and I want to update the points associated to his user:

When I try to update his points we get back the same error we have seen before when updating a tuple.

How can we get around this error?

Tuples are immutable but lists are mutable and we could use this concept to assign the new score to a new tuple in the list, at the same position of the original tuple in the list.

So, instead of updating the tuple at index 0 we will assign a new tuple to it.

Let’s see if it works…

It does work! Once again because a list is mutable .

And here is how we can make this code more generic?

Ok, this is a bit more generic because we didn’t have to provide the name of the user when updating his records.

This is just an example to show you how to address this TypeError , but in reality in this scenario I would prefer to use a dictionary instead.

It would allow us to access the details of each user from the name and to update the score without any issues.

Tuple Object Does Not Support Item Assignment Error With Values Returned by a Function

This error can also occur when a function returns multiple values and you try to directly modify the values returned by the function.

I create a function that returns two values: the number of users registered in our application and the number of users who have accessed our application in the last 30 days.

As you can see the two values are returned by the function as a tuple.

So, let’s assume there is a new registered user and because of that I try to update the value returned by the function directly.

I get the following error…

This can happen especially if I know that two values are returned by the function but I’m not aware that they are returned in a tuple.

Why Using Tuples If We Get This Error?

You might be thinking…

What is the point of using tuples if we get this error every time we try to update them?

Wouldn’t be a lot easier to always use lists instead?

We can see the fact that tuples are immutable as an added value for tuples when we have some data in our application that should never be modified.

Let’s say, for example, that our application integrates with an external system and it needs some configuration properties to connect to that system.

The tuple above contains two values: the API endpoint of the system we connect to and the port for their API.

We want to make sure this configuration is not modified by mistake in our application because it would break the integration with the external system.

So, if our code inadvertently updates one of the values, the following happens:

Remember, it’s not always good to have data structures you can update in your code whenever you want.

In this article we have seen when the error “tuple object does not support item assignment” occurs and how to avoid it.

You have learned how differently the tuple and list data types behave in Python and how you can use that in your programs.

If you have any questions feel free to post them in the comment below 🙂

Claudio Sabato is an IT expert with over 15 years of professional experience in Python programming, Linux Systems Administration, Bash programming, and IT Systems Design. He is a professional certified by the Linux Professional Institute .

With a Master’s degree in Computer Science, he has a strong foundation in Software Engineering and a passion for robotics with Raspberry Pi.

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[Solved] TypeError: ‘str’ Object Does Not Support Item Assignment

In this article, we will be discussing the TypeError:’str’ Object Does Not Support Item Assignment exception . We will also be going through solutions to this problem with example programs.

Why is This Error Raised?

When you attempt to change a character within a string using the assignment operator, you will receive the Python error TypeError: ‘str’ object does not support item assignment.

As we know, strings are immutable. If you attempt to change the content of a string, you will receive the error TypeError: ‘str’ object does not support item assignment .

There are four other similar variations based on immutable data types :

• TypeError: 'tuple' object does not support item assignment
• TypeError: 'int' object does not support item assignment
• TypeError: 'float' object does not support item assignment
• TypeError: 'bool' object does not support item assignment

Replacing String Characters using Assignment Operators

Replicate these errors yourself online to get a better idea here .

In this code, we will attempt to replace characters in a string.

Strings are an immutable data type. However, we can change the memory to a different set of characters like so:

TypeError: ‘str’ Object Does Not Support Item Assignment in JSON

Let’s review the following code, which retrieves data from a JSON file.

In line 5, we are assigning data['sample'] to a string instead of an actual dictionary. This causes the interpreter to believe we are reassigning the value for an immutable string type.

TypeError: ‘str’ Object Does Not Support Item Assignment in PySpark

The following program reads files from a folder in a loop and creates data frames.

This occurs when a PySpark function is overwritten with a string. You can try directly importing the functions like so:

TypeError: ‘str’ Object Does Not Support Item Assignment in PyMongo

The following program writes decoded messages in a MongoDB collection. The decoded message is in a Python Dictionary.

At the 10th visible line, the variable x is converted as a string.

It’s better to use:

Please note that msg are a dictionary and NOT an object of context.

TypeError: ‘str’ Object Does Not Support Item Assignment in Random Shuffle

The below implementation takes an input main and the value is shuffled. The shuffled value is placed into Second .

random.shuffle is being called on a string, which is not supported. Convert the string type into a list and back to a string as an output in Second

TypeError: ‘str’ Object Does Not Support Item Assignment in Pandas Data Frame

The following program attempts to add a new column into the data frame

The iteration statement for dataset in df: loops through all the column names of “sample.csv”. To add an extra column, remove the iteration and simply pass dataset['Column'] = 1 .

These are the causes for TypeErrors : – Incompatible operations between 2 operands: – Passing a non-callable identifier – Incorrect list index type – Iterating a non-iterable identifier.

The data types that support item assignment are: – Lists – Dictionaries – and Sets These data types are mutable and support item assignment

As we know, TypeErrors occur due to unsupported operations between operands. To avoid facing such errors, we must: – Learn Proper Python syntax for all Data Types. – Establish the mutable and immutable Data Types. – Figure how list indexing works and other data types that support indexing. – Explore how function calls work in Python and various ways to call a function. – Establish the difference between an iterable and non-iterable identifier. – Learn the properties of Python Data Types.

We have looked at various error cases in TypeError:’str’ Object Does Not Support Item Assignment. Solutions for these cases have been provided. We have also mentioned similar variations of this exception.

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Python typeerror: ‘tuple’ object does not support item assignment Solution

Tuples are immutable objects . “Immutable” means you cannot change the values inside a tuple. You can only remove them. If you try to assign a new value to an item in a variable, you’ll encounter the “typeerror: ‘tuple’ object does not support item assignment” error.

In this guide, we discuss what this error means and why you may experience it. We’ll walk through an example of this error so you can learn how to solve it in your code.

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Typeerror: ‘tuple’ object does not support item assignment.

While tuples and lists both store sequences of data, they have a few distinctions. Whereas you can change the values in a list, the values inside a tuple cannot be changed. Also, tuples are stored within parenthesis whereas lists are declared between square brackets.

Because you cannot change values in a tuple, item assignment does not work.

Consider the following code snippet:

This code snippet lets us change the first value in the “honor_roll” list to Holly. This works because lists are mutable. You can change their values. The same code does not work with data that is stored in a tuple.

An Example Scenario

Let’s build a program that tracks the courses offered by a high school. Students in their senior year are allowed to choose from a class but a few classes are being replaced.

Start by creating a collection of class names:

We’ve created a tuple that stores the names of each class being offered.

The science department has notified the school that psychology is no longer being offered due to a lack of numbers in the class. We’re going to replace psychology with philosophy as the philosophy class has just opened up a few spaces.

To do this, we use the assignment operator:

This code will replace the value at the index position 3 in our list of classes with “Philosophy”. Next, we print our list of classes to the console so that the user can see what classes are being actively offered:

Use a for loop to print out each class in our tuple to the console. Let’s run our code and see what happens:

Our code returns an error.

The Solution

We’ve tried to use the assignment operator to change a subject in our list. Tuples are immutable so we cannot change their values. This is why our code returns an error.

To solve this problem, we convert our “classes” tuple into a list . This will let us change the values in our sequence of class names.

Do this using the list() method:

We use the list() method to convert the value of “classes” to a list. We assign this new list to the variable “as_list”. Now that we have our list of classes stored as a list, we can change existing classes in the list.

Let’s run our code:

Our code successfully changes the “Psychology” class to “Philosophy”. Our code then prints out the list of classes to the console.

If we need to store our data as a tuple, we can always convert our list back to a tuple once we have changed the values we want to change. We can do this using the tuple() method:

This code converts “as_list” to a tuple and prints the value of our tuple to the console:

We could use this tuple later in our code if we needed our class names stored as a tuple.

The “typeerror: ‘tuple’ object does not support item assignment” error is raised when you try to change a value in a tuple using item assignment.

To solve this error, convert a tuple to a list before you change the values in a sequence. Optionally, you can then convert the list back to a tuple.

Now you’re ready to fix this error in your code like a pro !

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How to Fix the Python Error: typeerror: 'str' object does not support item assignment

People come to the Python programming language for a variety of different reasons. It’s highly readable, easy to pick up, and superb for rapid prototyping. But the language’s data types are especially attractive. It’s easy to manipulate Python’s various data types in a number of different ways. Even converting between dissimilar types can be extremely simple. However, some aspects of Python’s data types can be a little counterintuitive. And people working with Python’s strings often find themselves confronted with a “typeerror: ‘str’ object does not support item assignment” error .

The Cause of the Type Error

The “ typeerror : ‘str’ object does not support item assignment” is essentially notifying you that you’re using the wrong technique to modify data within a string. For example, you might have a loop where you’re trying to change the case of the first letter in multiple sentences. If you tried to directly modify the first character of a string it’d give you a typeerror . Because you’re essentially trying to treat an immutable string like a mutable list .

A Deeper Look Into the Type Error

The issue with directly accessing parts of a string can be a little confusing at first. This is in large part thanks to the fact that Python is typically very lenient with variable manipulation. Consider the following Python code.

y = [0,1,2,3,4] y[1] = 2 print(y)

We assign an ordered list of numbers to a variable called y. We can then directly change the value of the number in the second position within the list to 2. And when we print the contents of y we can see that it has indeed been changed. The list assigned to y now reads as [0, 2, 2, 3, 4].

We can access data within a string in the same way we did the list assigned to y. But if we tried to change an element of a string using the same format it would produce the “typeerror: ‘str’ object does not support item assignment”.

There’s a good reason why strings can be accessed but not changed in the same way as other data types in the language. Python’s strings are immutable. There are a few minor exceptions to the rule. But for the most part, modifying strings is essentially digital sleight of hand.

We typically retrieve data from a string while making any necessary modifications, and then assign it to a variable. This is often the same variable the original string was stored in. So we might start with a string in x. We’d then retrieve that information and modify it. And the new string would then be assigned to x. This would overwrite the original contents of x with the modified copy we’d made.

This process does modify the original x string in a functional sense. But technically it’s just creating a new string that’s nearly identical to the old. This can be better illustrated with a few simple examples. These will also demonstrate how to fix the “typeerror: ‘str’ object does not support item assignment” error .

How To Fix the Type Error

We’ll need to begin by recreating the typeerror. Take a look at the following code.

x = “purString” x[0] = “O” print (x)

The code begins by assigning a string to x which reads “purString”. In this example, we can assume that a typo is present and that it should read “OurString”. We can try to fix the typo by replacing the value directly and then printing the correction to the screen. However, doing so produces the “typeerror: ‘str’ object does not support item assignment” error message. This highlights the fact that Python’s strings are immutable. We can’t directly change a character at a specified index within a string variable.

However, we can reference the data in the string and then reassign a modified version of it. Take a look at the following code.

x = “purString” x = “O” + x[1::] print (x)

This is quite similar to the earlier example. We once again begin with the “purString” typo assigned to x. But the following line has some major differences. This line begins by assigning a new value to x. The first part of the assignment specifies that it will be a string, and begin with “O”.

The next part of the assignment is where we see Python’s true relationship with strings. The x[1::] statement reads the data from the original x assignment. However, it begins reading with the first character. Keep in mind that Python’s indexing starts at 0. So the character in the first position is actually “u” rather than “p”. The slice uses : to signify the last character in the string. Essentially, the x[1::] command is shorthand for copying all of the characters in the string which occur after the “p”. However, we began the reassignment of the x variable by creating a new string that starts with “O”. This new string contains “OurString” and assigns it to x.

Again, keep in mind that this functionally replaces the first character in the x string. But on a technical level, we’re accessing x to copy it, modifying the information, and then assigning it to x all over again as a new string. The next line prints x to the screen. The first thing to note when we run this code is that there’s no Python error anymore. But we can also see that the string in x now reads as “OurString”.

How to Solve ‘Tuple’ Object Does Not Support Item Assignment (Python)

Here’s everything about TypeError: ‘Tuple’ Object Does Not Support Item Assignment in Python.

You’ll learn:

• The specifics of the tuple data type
• The difference between immutable and mutable data types
• How to change immutable data types

So if you want to understand this error in Python and how to solve it, then you’re in the right place.

Let’s jump right in!

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Mutable, or Immutable? That Is the Question

Data types in Python are mutable or immutable .

All data types that are numeric , for example, are immutable . 

You can write something like this:

Have you changed the variable a ? 

Not really: When you write a = 1 , you put the object 1 in memory and told the name a to refer to this literal. 

Next, when you write a = a + 1 , Python evaluates the expression on the right:

Python takes the object referred by a (the 1 ) and then adds 1 to it. 

You get a new object, a 2 . This object goes right into the memory and a references instead of object 1 . 

The value of object 1 has not changed—it would be weird if 1 would out of a sudden a 2 , for example, wouldn’t it? So instead of overwriting an object ( 1 ), a new object ( 2 ) is created and assigned to the variable ( a ).

Mutable Data Types

More complex data types in Python are sequences such as: 

• Byte Arrays

Sequences contain several values, which can be accessed by index.

However, some sequences are mutable (byte arrays, lists) , while others are immutable (tuples) . 

You can create a tuple and access its elements like this:

Yet if you try to change one of the elements, you get an error:

Notice that the item in the tuple at index 2 is a list. You can change the list without changing the tuple:

The object stored in the tuple remains the same, but its contents have changed. But what if you still need to change the element in the tuple?

You can do this by converting the tuple to a list. Then you change the element, and then convert the list to a tuple again:

For large amounts of data, conversion operations can take quite a long time:

As you can see, for a list of 100 million float numbers, this operation takes about a second. This is not a long time for most tasks, but it is still worth considering if you are dealing with large amounts of data.

However, there is another way to “change” a tuple element—you can rebuild a tuple using slicing and concatenation:

Note that it is necessary to put a comma in parentheses to create a tuple of one element. If you use just parentheses, then (‘uno’) is not a tuple, but a string in parentheses . 

Concatenating a string with a tuple is not possible:

Interestingly, you can use shorthand operators on a tuple, like this:

Or even like this:

3 Examples of TypeError: ‘Tuple’ Object Does Not Support Item Assignment in Python

Let’s look at some practical examples of when this error can occur. The simplest is when you initially enter the sequence incorrectly:

In this example, the name list1 refers to a tuple despite the list in the name. The name does not affect the type of variable. To fix this error, simply change the parentheses to square brackets in the constructor:

Perhaps you have a list with some values, such as the student’s name and grade point average:

Alice did a poor job this semester, and her GPA dropped to 90:

Unfortunately, you cannot just change the average score in such a list. You already know that you can convert a tuple to a list, or form a new tuple. For example, like this:

However, if you need to change values regularly, it makes sense to switch from a list of tuples to a dictionary. Dictionaries are a perfect fit for such tasks. You can do this easily with the dict() constructor:

Now you can change the average by student name:

#1 Real World Example of TypeError: ‘Tuple’ Object Does Not Support Item Assignment in Python

An interesting example of a novice programmer trying to enter values in a list from the keyboard using the eval() function:

This method is not very reliable by itself.

Even if the user enters the correct sequence separated by commas—for example, 3, 2, 4, 1 —it will be evaluated in a tuple. 

Naturally, an attempt to assign a new value to a tuple element in the line list[i +1] = list[i] raises a TypeError: ‘tuple’ object does not support item assignment . 

Here, you see another mistake—which, by the way, may even be invisible during program execution. 

The my_sort function uses the list data type name as the argument name. This is not only the name of the data type, but also the list constructor. 

Python will not throw an error while executing this code, but if you try to create a list using the constructor inside the my_sort function, you will have big problems.

In this case, to enter elements into the list, it would be more correct to read the entire string and then split it using the split() method. If you need integer values, you can also apply the map() function, then convert the resulting map object into a list:

The construction looks a little cumbersome, but it does its job. You can also enter list items through a list comprehension:

You can choose the design that you like best.

#2 Real World Example of TypeError: ‘Tuple’ Object Does Not Support Item Assignment in Python

Another example of when a TypeError: ‘tuple’ object does not support item assignment may occur is the use of various libraries. 

If you have not studied the documentation well enough, you may not always clearly understand which data type will be returned in a given situation. In this example, the author tries to make the picture redder by adding 20 to the red color component:

This produces an error on the line pixel[0] = pixel[0] + 20 . How?

You are converting pixels to a list in line of code 3 . Indeed, if you check the type of the pixels variable, you get a list:

However, in the loop, you iterate over the pixels list elements, and they already have a different type. Check the type of the pixels list element with index 0 :

And this is a tuple!

So, you can solve this problem by converting lists to tuples inside a loop, for example.

However, in this case, you will need to slightly adjust the iterable value. This is because you will need the pixel color values and the index to write the new values into the original array. 

For this, use the enumerate() function:

The program will work successfully with that version of a loop, and you will get a redder image at the output. It would be more correct to trim values above 255 , for example:

But if the program consists only of this transformation, then Python will already truncate the values when saving the image.

Here’s more Python support:

• 9 Examples of Unexpected Character After Line Continuation Character
• 3 Ways to Solve Series Objects Are Mutable and Cannot be Hashed
• How to Solve SyntaxError: Invalid Character in Identifier
• ImportError: Attempted Relative Import With No Known Parent Package
• IndentationError: Unexpected Unindent in Python (and 3 More)

Tech entrepreneur and founder of Tech Medic, who has become a prominent advocate for the Right to Repair movement. She has testified before the US Federal Trade Commission and been featured on CBS Sunday Morning, helping influence change within the tech industry.

Typeerror: int object does not support item assignment

Today, we will explore the “typeerror: int object does not support item assignment” error message in Python.

If this error keeps bothering you, don’t worry! We’ve got your back.

In this article, we will explain in detail what this error is all about and why it occurs in your Python script.

What is “typeerror: ‘int’ object does not support item assignment”?

It is mainly because integers are immutable in Python, meaning their value cannot be changed after they are created.

For example:

In this example, the code tries to assign the value 1 to the first element of sample , but sample is an integer, not a list or dictionary, and as a result, it throws an error:

This error message indicates that you need to modify your code to avoid attempting to change an integer’s value using item assignment.

What are the root causes of “typeerror: ‘int’ object does not support item assignment”

How to fix “typeerror: int object does not support item assignment”, solution 1: use a list instead of an integer.

Since integers are immutable in Python, we cannot modify them.

Solution 2: Convert the integer to a list first

You have to convert the integer first to a string using the str() function.

Finally, we convert the string back to an integer using the int() function.

Solution 3: Use a dictionary instead of an integer

Another example:

Solution 4: Use a different method or function

You can define sample as a list and append items to the list using the append() method .

How to avoid “typeerror: int object does not support item assignment”

Frequently asked question (faqs).

The error occurs when you try to modify an integer object, which is not allowed since integer objects are immutable.

You could also check out other “ typeerror ” articles that may help you in the future if you encounter them.

TypeError: 'src' object does not support item assignment

The assignment str[i] = str[j] is working inconsistently. Please refer to the screenshots and let me know if I am missing something.

We are receiving TypeError: ‘src’ object does not support item assignment

Regards, Praveen. Thank you!

Please don’t use screenshots. Show the code and the traceback as text.

Strings are immutable. You can’t modify a string by trying to change a character within.

You can create a new string with the bits before, the bits after, and whatever you want in between.

Yeah, you cannot assign a string to a variable, and then modify the string, but you can use the string to create a new one and assign that result to the same variable. Borrowing some code from @BowlOfRed above, you can do this:

CS 2110: Object-Oriented Programming and Data Structures

Assignment 1.

A1 consists of a series of exercises to help you transition to procedural programming in the Java language. The problem-solving elements are at the level of lab exercises from CS 1110/1112. The assignment comes bundled with a thorough test suite, so you will know when you have implemented each method’s specifications correctly.

You must work on this assignment independently (no partners)—we want to ensure that every student can write, test, and submit Java code on their own. For this reason, we are also grading this assignment for mastery ; if a grader identifies mistakes that you didn’t catch yourself, you may resubmit once to correct them without penalty.

Learning objectives

• Author Java code in the IntelliJ IDEA IDE.
• Employ operations on Java’s primitive types ( boolean , int , double ) and strings to solve high-level problems.
• Employ Java control structures ( if , for , while ) to implement algorithms for solving high-level problems.
• Select relevant mathematical functions from Java’s standard library by referencing JavaDoc pages.
• Verify the correctness of implementations by running JUnit test cases.
• Adopt good programming style to facilitate readability and maintenance.
• Witness examples of precise method specifications that separate “what” from “how”.

If you are worried that these exercises seem a bit dry and mathematical, that is a consequence of restricting ourselves to Java’s primitive types (which are mostly numbers). Once we get to object-oriented programming in A2, the problem domains will become richer.

Collaboration policy

This assignment is to be completed as an individual. You may talk with others to discuss Java syntax, debugging tips, or navigating the IntelliJ IDE, but you should refrain from discussing algorithms that might be used to solve the problems, and you must never show your in-progress or completed code to another student. Consulting hours are the best way to get individualized assistance at the source code level.

Frequently asked questions

There is a pinned post on Ed where we will post any clarifications for this assignment. Please review it before asking a new question in case your concern has already been addressed. You should also review the FAQ before submitting to see whether there are any new ideas that might help you to improve your solution.

I. Getting started

You already know at least one procedural language (e.g. Python) with which you should be able to solve the problems on this assignment. If that language is not Java, then the goal is for you to become comfortable with procedural Java syntax, as it compares with what you already know, by practicing it in targeted problems. Start by reading transition to Java on the course website, which provides a focused translation guide between Python, MATLAB, and Java.

Download the release code from the CMSX assignment page; it is a ZIP file named “a1-release.zip”. Decide where on your computer’s disk you want your project to be stored (we recommend a “CS2110” directory under your home or documents folder), then extract the contents of the ZIP file to that directory. Find the folder simply named “a1” (depending on your operating system, this may be under another folder named “a1-release”); its contents should look like this:

We assume you have already followed the setup instructions for IntelliJ, possibly in your first discussion section. It is important that JDK 21 has been downloaded.

In IntelliJ, select File | Open , then browse to the location of this “a1” directory, highlight “a1”, and click OK . IntelliJ may ask whether you want to open the project in the same window or a new one; this is up to you, noting that if you choose the same window, whatever project you previously had open (e.g. a discussion activity or old assignment) will be closed.

Please keep track of how much time you spend on this assignment. There is a place in “reflection.txt” for reporting this time, along with asserting authorship.

II. Working with the provided code

Specifications and preconditions.

A recurring theme in this course is distinguishing between the roles of client and implementer . For methods, a client is someone who calls a method, and the implementer is someone who writes the method’s body. Although you might act both as client and implementer in a small project, ideally the two roles have no knowledge of one another, so you should keep track of which role you are currently in and “split your brain” accordingly. For most of this assignment you will be in the implementer role relative to the assignment’s methods.

Each method is accompanied by a specification in a JavaDoc comment. As the implementer, your job is to write a method body that fulfills that specification. Specifications may include a precondition phrased as a “requires” clause. As the implementer, you can assume that the precondition is already satisfied. You do not have to attempt to check the precondition or to handle invalid arguments in any special way. It would be the responsibility of clients to ensure that they do not violate such conditions.

For example, if a specification contains the precondition “ nTerms is non-negative”, then the client is never permitted to pass negative arguments to the function. If the client nonetheless does so, the specification promises nothing about the result. Specifically, the specification does not promise that the function will check for non-negativity, and the specification does not promise that any kind of error will be produced. That means the implementer has an easy job: they can simply ignore the possibility of negative arguments.

You might have been taught in previous programming classes that implementers must always check preconditions, or must always produce an error when a precondition is violated. Those are useful and important defensive programming techniques! (And we will see how to employ them in Java soon.) But the point we are making here is that they are not mandated by a “requires” clause. So in this assignment, you do not have to use such techniques, and it’s likely to be easier for you to omit them entirely.

Replacing method “stubs”

The body of each method initially looks like this:

This is a placeholder —it allows the method to compile even though it doesn’t return a value yet, but it will cause any tests of the method to fail. You should delete these lines as the first step when implementing each method. (We’ll discuss the meaning of these lines later in the course when we cover exceptions, objects, and so forth.)

Use the TODO comments to guide you to work that still needs to be done. As you complete each task, remove the comment line with the TODO since it doesn’t need doing anymore! Temporary comment prefixes like TODO and FIXME are a convenient way to keep track of your progress when writing and debugging code; IntelliJ will even track them for you in its TODO window .

Finally, some method bodies contain comments with “implementation constraints.” These are not part of the specification, as they do not affect potential clients. Instead, they are requirements of the assignment to ensure that you get practice with the necessary skills. Violating these constraints will not cause unit tests to fail, but points will be deducted by your grader, so make sure you obey them.

Test cases for each method are in “tests/cs2110/A1Test.java”. You are encouraged to read the test suites to see what corner cases are considered, but you do not need to add any tests of your own for this assignment.

To run a test case, click the green arrow to the left of the method name, then select “Run”; the results will be shown at the bottom of the screen. To run all test cases, use the arrow to the left of the class name ( A1Test ). If a test fails with a yellow “X”, that means it returned the wrong result. By reading the messages in the output window, you should be able to determine which case failed and what your implementation computed instead. If it fails with a red “!”, that means it encountered an error (or you forgot to delete the placeholder throw line).

Take note of the style of these tests. While you may not understand all of the Java syntax yet, you should see that related tests are grouped together and given descriptive names. This makes it easier to debug your code, since your IDE will clearly show which scenarios are behaving as expected and which are not. You are expected to adopt this style for your own tests on future assignments.

III. Assignment walkthrough

Implement the methods one at a time. As soon as you implement one, run the corresponding test case to verify your work. Do not modify any method signatures (or return types or throws clauses)—not only would that change the class type we provided, but it would make it impossible for our autograder to interoperate with your code. And do not leave print statements in your final submission unless the method specification mentions printing output as a side effect.

Each of the numbered exercises below references a section of the Supplement 1 chapter of the primary course textbook, Data Structures and Abstraction with Java , 5th edition, to which you should have access in Canvas through the “Course Materials” link. That supplement is designed to help students who know how to program, but are new to Java. It is a great resource for making the transition to Java.

1. Regular polygons

[Textbook: S1.29: The Class Math ]

The area of a regular polygon with n sides of length s is given by the formula:

$$A = \frac{1}{4} s^2 \frac{n}{\tan(\pi/n)}$$

Implement this formula. You will need one or more math functions and/or constants from Java’s standard library. Skim the JavaDoc page for the static methods in the Math class to learn which functions are available. Remember that a Math. prefix is required when calling them (so to compute the absolute value of -5, you would write Math.abs(-5) ).

Take some time to explore these functions and get a feel for how Java’s standard library is documented. The functions you are most likely to use later in the course include: abs() , min() , max() , sqrt() , pow() , and the trigonometric functions.

Note: methods dealing with dimensionful quantities (like length and area) should always say something about what units (e.g. meters, acres) those quantities are measured in. In this case, the formula makes no assumptions about units, so the specification simply tells the client that the units of the output are compatible with the units of the input.

2. Collatz sequence

[Textbook: S1.59: The while Statement]

The Collatz conjecture is a fun piece of mathematical trivia: by repeatedly performing one of two simple operations on a positive integer (depending on whether it is even or odd), you always seem to get back to 1. The rules for determining the next number in the sequence are:

• If the last number was even, divide it by 2.
• If the last number was odd, multiply it by 3 and add 1.

Our objective is to sum all of the terms in the sequence starting from a given “seed” number until we get to 1. This involves indefinite iteration , and you should use a while loop for this.

This is also a chance to practice problem decomposition and defining new methods. Declare and implement a method named nextCollatz() that takes one int argument and returns an int value according to the given specification. When you have done this, remove the TODO and uncomment the relevant test case in A1Test (it was commented out because the test case will not compile unless that method is at least declared, preventing you from running tests for other methods in the suite). Tip: there is an IntelliJ keyboard shortcut for commenting and uncommenting whole selections of code; can you find it?

3. Median of three

[Textbook: S1.38: The if-else Statement]

The median value of a collection of numbers is the value that would be in the middle if the collection were sorted. A special case is median-of-three voting , which is used in fault-tolerant systems to decide how to proceed when not all components agree. This small function is actually one of the most commonly-run procedures in SpaceX’s flight software, helping it determine which sensors and commands to trust dozens of times per second.

You need to develop an algorithm for determining which of three numbers is the middle value. The numbers could be in any order, and there could be duplicates. Use a chain of conditional statements ( if / else ), possibly nested, to find the middle value.

4. Interval overlaps

[Textbook: S1.41: Boolean Expressions]

Intervals are a useful abstraction when working with schedules. For example, if class meeting times are represented as intervals over the seconds of a day, then an overlap would imply that two classes conflict.

This exercise is designed to help you avoid a common “anti-pattern” among new programmers:

(here, expr is a Boolean expression, like x > 0 ). Remember that the conditions used in if statements are expressions that yield a boolean value and can be used anywhere a boolean value like true or false could be used. Therefore, the above code can (and should) be rewritten as:

Keeping this in mind, implement intervalsOverlap() using a single return statement.

5. Estimating pi

[Textbook: S1.61: The for Statement]

The Madhava-Leibniz series is an infinite sum of numbers that is related to π:

$$\frac{\pi}{4} = 1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \frac{1}{9} - \ldots$$

Observe that the denominators of the terms are the sequence of odd integers and that the sign alternates between plus and minus.

By truncating this series after a finite number of terms, we get an approximation for π (though this particular formula requires many terms for even modest accuracy). Use a for -loop to evaluate this approximation for a specified number of terms (this is an example of definite iteration ). Recall that integer division in Java rounds down to another integer, so you may need to cast some numbers to a floating-point type when evaluating the fractions.

As a corner case, note that the sum of zero terms is 0.

6. Palindromes

[Textbook: S1.67: The Class String ]

With control structures and primitive types out of the way, it’s time to get some experience with our first aggregate type : String (an aggregate type is one that groups together multiple values, like how a String contains multiple char s). Strings get some special treatment in Java; while they are objects , they are immutable (their contents can’t be changed), which means they behave much like primitive values. And unlike other objects, they have their own literals and even an operator ( + for concatenation). But as a sequence of characters they are like arrays, giving you some early practice with algorithms that iterate over data.

A palindrome has the same sequence of characters when written backwards as when written normally. To examine the i th character in string s , use s.charAt(i) . The total number of characters in s is given by s.length() . In Java, the index of the first character is 0 , and the index of the last character is s.length() - 1 . The specifications for these methods are in the API documentation for String ; by calling them, you are now in the client role with respect to the String class.

7. Formatting messages

[Textbook: S1.70: Concatenation of Strings]

A common task in computing systems is to format information to be read by humans. The system may need to support translations in multiple languages, and sometimes words will change depending on the data being explained (e.g. singular vs. plural nouns, “a” vs. “an” depending on the following word, etc.). To manage this potential complexity, it is a good idea to move formatting logic into its own function (Java actually provides a sophisticated infrastructure for managing this in large applications, but that is beyond the scope of this course).

This exercise requires you to concatenate strings and to format numerical data as a string. There are several approaches you can take; the + operator is probably most convenient, but if you have used a format or printf feature in another language, you might be interested in String ’s format() method. This is also a good opportunity to get practice with Java’s ternary operator ?: , an awkward-to-read but extremely useful bit of syntax; use this to decide between the singular and plural forms of “item” without using an if -statement.

8. Making a program

Now it’s time to step into the client role. Add a main() method so that the A1 class can be run as a program. Find a way to use at least four of the methods in A1 in combination, then print the final result. Is is okay to be silly here! Ideas include:

• Compute the sums of three Collatz sequences of your choice, then take their median; use this as the number of sides of a polygon. For the length of the polygon’s sides, use an estimate of π. Print the polygon’s area.
• Compute the median of three numbers of your choice, then find the next number in the Collatz sequence after it. Use this as the number of items in an order, then determine whether that order’s confirmation message is a palindrome.

You can be creative here and provide arbitrary inputs as necessary, but all four methods must contribute somehow to the final result. For this assignment, you should hard-code your inputs, rather than expecting program arguments (in other words, ignore args ).

Your program’s printed output should be a complete sentence written in English. It should describe what final operation was performed, what its inputs were, and what the result was (the inputs and outputs should not be baked into the printed text; instead, you should print the values of program variables or expressions). For example, “The area of a polygon with 4 sides of length 0.5 m is 0.25 m^2.” When you run your program, make sure this is the only output (i.e., that there are no “debugging prints” in the other methods you are calling).

9. Reflecting on your work

Stepping back and thinking about how you approached an assignment (a habit called metacognition ) will help you make new mental connections and better retain the skills you just practiced. Therefore, each assignment will ask you to write a brief reflection in a file called “reflection.txt”. This file is typically divided into three sections:

• Submitter metadata: Assert authorship over your work, and let us know how long the assignment took you to complete.
• Verification questions: These will ask for a result that is easily obtained by running your assignment. (Do not attempt to answer these using analysis; the intent is always for you to run your program, possibly provide it with some particular input, and copy its output.)
• Reflection questions: These will ask you write about your experience completing the assignment. We’re not looking for an essay, but we do generally expect a few complete sentences.

Respond to the four TODOs in “reflection.txt” (you can edit this file in IntelliJ).

IV. Scoring

This assignment is evaluated in the following categories (note: weights are approximate and may be adjusted slightly in final grading):

• Submitted and compiles (25%)
• Fulfills specifications (41%)
• Complies with implementation constraints (25%)
• Exhibits good code style (5%)
• Responds to reflection questions (4%)

You can maximize the “fulfilling specifications” portion of your score by passing all of the included unit tests (don’t forget to uncomment the ones for nextCollatz() ). The smoketester will also run these tests for you when you submit so you can be sure that your code works as well for us as it does for you.

Formatting is a subset of style. To be on the safe side, ensure that our style scheme is installed and that you activate “Reformat Code” before submitting. Graders will deduct for obvious violations that detract from readability, including improper indentation and misaligned braces.

But beyond formatting, choose meaningful local variable names, follow Java’s capitalization conventions (camelCase), and look for ways to simplify your logic. If the logic is subtle or the intent of a statement is not obvious, clarify with an implementation comment.

V. Submission

Upload your “A1.java” and “reflection.txt” files to CMSX before the deadline. If you forgot where your project is saved on your computer, you can right-click on “A1.java” in IntelliJ’s project browser and select “Open In”, then your file explorer (e.g. “Explorer” for Windows, “Finder” for Mac). Be careful to only submit “.java” files, not files with other extensions (e.g. “.class”).

After you submit, CMSX will automatically send your submission to a smoketester , which is a separate system that runs your solution against the same tests that we provided to you in the release code. The purpose of the smoketester is to give you confidence that you submitted correctly. You should receive an email from the smoketester shortly after submitting. Read it carefully, and if it doesn’t match your expectations, confirm that you uploaded the intended version of your file (it will be attached to the smoketester feedback). Be aware that these emails occasionally get misclassified as spam, so check your spam folder. It is also possible that the smoketester may fall behind when lots of students are submitting at once. Remember that the smoketester is just running the same tests that you are running in IntelliJ yourself, so don’t panic if its report gets lost—we will grade all work that is submitted to CMSX, whether or not you receive the email.

(Note: it may take us a day after the assignment is released before the smoketester is up and running.)

How to Solve Python TypeError: ‘tuple’ object does not support item assignment

by Suf | Programming , Python , Tips

Tuples are immutable objects, which means you cannot change them once created. If you try to change a tuple in place using the indexing operator [], you will raise the TypeError: ‘tuple’ object does not support item assignment.

To solve this error, you can convert the tuple to a list, perform an index assignment then convert the list back to a tuple.

This tutorial will go through how to solve this error and solve it with the help of code examples.

Table of contents

Typeerror: ‘tuple’ object does not support item assignment.

Let’s break up the error message to understand what the error means. TypeError occurs whenever you attempt to use an illegal operation for a specific data type.

The part 'tuple' object tells us that the error concerns an illegal operation for tuples.

The part does not support item assignment tells us that item assignment is the illegal operation we are attempting.

Tuples are immutable objects, which means we cannot change them once created. We have to convert the tuple to a list, a mutable data type suitable for item assignment.

Let’s look at an example of assigning items to a list. We will iterate over a list and check if each item is even. If the number is even, we will assign the square of that number in place at that index position.

Let’s run the code to see the result:

We can successfully do item assignments on a list.

Let’s see what happens when we try to change a tuple using item assignment:

We throw the TypeError because the tuple object is immutable.

To solve this error, we need to convert the tuple to a list then perform the item assignment. We will then convert the list back to a tuple. However, you can leave the object as a list if you do not need a tuple.

Let’s run the code to see the updated tuple:

Congratulations on reading to the end of this tutorial. The TypeError: ‘tuple’ object does not support item assignment occurs when you try to change a tuple in-place using the indexing operator [] . You cannot modify a tuple once you create it. To solve this error, you need to convert the tuple to a list, update it, then convert it back to a tuple.

For further reading on TypeErrors, go to the article:

• How to Solve Python TypeError: ‘str’ object does not support item assignment

To learn more about Python for data science and machine learning, go to the  online courses page on Python  for the most comprehensive courses available.

Have fun and happy researching!

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python type() TypeError: 'str' object is not callable [closed]

I have the following code:

I get the following error:

Can someone please explain?

• 5 You need to provide a minimum reproducible example. The above code does not produce that error. You most likely defined type elsewhere. –  BTables Commented 2 days ago
• 7 You probably created a variable type which is shadowing the built-in function earlier in your program. –  flakes Commented 2 days ago

I just ran your code, and it didn't seem to have any errors.

So, I assume your problem is that you defined type somewhere earlier in the code like this:

Generally it's best practice if you do not define things that are functions or class.

• 4 See Why should I help close "bad" questions that I think are valid, instead of helping the OP with an answer? Phrased differently, this question might be reasonable to answer, but it should be closed in its present state due to the lack of a minimal reproducible example . –  Anerdw Commented 2 days ago

Not the answer you're looking for? Browse other questions tagged python typeerror or ask your own question .

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• Why is PUT Request not allowed by default in OWASP CoreRuleSet
• How do eradicated diseases make a comeback?
• Parody of Fables About Authenticity
• What would be non-slang equivalent of "copium"?
• Could someone tell me what this part of an A320 is called in English?
• "TSA regulations state that travellers are allowed one personal item and one carry on"?
• Should I report a review I suspect to be AI-generated?
• Plotting orbitals on a lattice
• Do the amplitude and frequency of gravitational waves emitted by binary stars change as the stars get closer together?
• What is the meaning of "against" in "against such things there is no law" Galatians 5:23?
• Is there a way to resist spells or abilities with an AOE coming from my teammates, or exclude certain beings from the effect?
• Stuck on Sokoban
• Has a tire ever exploded inside the Wheel Well?
• Is it possible to have a planet that's gaslike in some areas and rocky in others?
• DATEDIFF Rounding
• How much payload could the Falcon 9 send to geostationary orbit?
• Is having negative voltages on a MOSFET gate a good idea?
• Two way ANOVA or two way repeat measurement ANOVA
• Are quantum states like the W, Bell, GHZ, and Dicke state actually used in quantum computing research?
• Why does flow separation cause an increase in pressure drag?