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How To Solve TypeError: 'Str' Object Does Not Support Item Assignment In Python - LearnShareIT

How To Solve TypeError: ‘Str’ Object Does Not Support Item Assignment In Python

TypeError: ‘str’ object does not support item assignment

To fix the TypeError: ‘str’ object does not support item assignment error in Python, there are two solutions we have effectively tested. Follow the article to better understand.

What causes this error?

The “TypeError: ‘str’ object does not support item assignment” error happens when you try to change a character. In Python, strings are immutable so this is the cause of this errors.

Example:

myStr = 'John'
myStr[0] = 'f'

Output:

Traceback (most recent call last):
  File "prog.py", line 2, in <module>
    myStr [0] = 'f'
TypeError: 'str' object does not support item assignment

You cannot modify a single character of the string.

How to solve TypeError: ‘str’ object does not support item assignment in Python?

Using the list() method

Example:

  1. Convert the string with the character to be changed to a list.
  2. Change list items at a specific index.
  3. Join the items in the list into a new string.
myStr = '*LearnShareIT*'
myList = list(myStr)
print(myList)  

# Change list items at a specific index
myList[0] = 'Hi'

# Join the items in the list into a new string
newString = ''.join(myList) 
print(newString)  

Output:

['*', 'L', 'e', 'a', 'r', 'n', 'S', 'h', 'a', 'r', 'e', 'I', 'T', '*']
HiLearnShareIT*

Note:

  • Since the list is mutable, it is possible for you to change the list items.
  • The str.join() method gets all the items in an iterable and joins them into a string. You must specify a string as the separator. In the example above, the string is separated by a empty '' character.

Using the ‘replace()’ method

The replace() method replaces a phrase with another specified phrase.

Syntax:

string.replace(oldvalue, newvalue, count)

Parameters:

  • oldvalue: the string you want to replace.
  • newvalue: the string that you will replace in place of ‘oldvalue’.
  • count: (optional) shows the number of occurrences of the string ‘oldvalue’ (the string you want to replace).

Example 1:

myStr = "a a b b c c d d"
result = myStr.replace("a", "g")

print(result)

Output:

g g b b c c d d

Example 2:

myStr = "a a b b c c d d"
result = myStr.replace("a", "g", 1)

print(result)

Output:

g a b b c c d d

The first ‘a’ of the string is replaced with the letter ‘g’.

Summary

In this tutorial, I’ve explained how to solve the TypeError: ‘str’ object does not support item assignmen in Python. If you have any questions about this issue, please comment below. I will answer your questions. Thanks for reading!

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