How to replace all occurrences of a character in a Python string

Overview

In Python, we can replace all occurrences of a character in a string using the following methods:

replace()
re.sub()

The `replace()` method

replace() is a built-in method in Python that replaces all the occurrences of the old character with the new character.

Syntax

"".replace(oldCharacter, newCharacter, count)

Syntax of replace()

Parameters

This method accepts the following parameters:

oldCharacter: This is the old character that will be replaced.
newCharacter: This is the new character that will replace the old character.
count: This is an optional parameter that specifies the number of times to replace the old character with the new character.

Return value

This method creates a copy of the original string, replaces all the occurrences of the old character with the new character, and returns it.

Example

string = "This is an example string"

# replace all the occurrences of "i" with "I"
result = string.replace("i", "I")

# print result
print(result)

Explanation

Line 1: We declare a string.
Line 4: We use the replace() method to replace all the occurrences of i with I.
Line 7: We print the result to the console.

Output

In the output, we can see all the occurrences of i in the string are replaced with I.

The `re.sub()` method

We can also use regular expressions to replace all the occurrences of a character in a string. This can be done using re.sub() method.