Python String | replace()

The replace() in Python returns a copy of the string where all occurrences of a substring are replaced with another substring. 

Syntax of replace()

Syntax: string.replace(old, new, count)

Parameters: 

• old – old substring you want to replace.
• new – new substring which would replace the old substring.
• count – (Optional ) the number of times you want to replace the old substring with the new substring. 

Return Value : It returns a copy of the string where all occurrences of a substring are replaced with another substring. 

Replace All Instances of a Single Character using replace()

In this example, we are only replacing a single character from a given string. The Python replace() method is case-sensitive, and therefore it performs a case-sensitive substring substitution, i.e. R in FOR is unchanged.

Output : 

grrks FOR grrks
geeks FOR geeks

Replace All Instances of a String

Here, we replaced all the geeks with GeeksforGeeks using replace() function.

Output : 

geeks for geeks 
geeks for geeks
GeeksforGeeks for GeeksforGeeks 
GeeksforGeeks for GeeksforGeeks

Replace Only a Certain Number of Instances using replace()

In this example, we are replacing certain numbers of words. i.e. “ek” with “a” with count=3.

Output:  

gaaks for gaaks gaaks gaaks gaaks
geas for geas geas geeks geeks