How to modify a string in Python

You cannot!

Strings in Python are immutable (something that cannot be changed)

Why are Python strings immutable?

Read here

What can you do?

You can create a new modified string.

Examples

Convert all characters to upper case

original = "My String" new_string = original.upper() print(new_string) # "MY STRING" 

Change one character

Since you can't really change the string, the solution is to convert it a mutable type like list and modify that.

original = "My String" original_list = list(original) original_list[0] = 'm' new_string = "".join(original_list) print(new_string) # 'my String' 

You could also try slicing to speed up the process