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How to use string.replace() in Python

15 Oct 2019 9:31 am || 0

In python replace() is an inbuilt function which returns a string by replacing sub-string with another sub-string, with all occurrences of specified numbers.

Syntax

original-string.replace(old-sub-string, new-sub-string[, max])

Parameters:

  • old-substring: (Required): The old sub-string to replace
  • new-substring: (Required): The new sub-string to replace with
  • max: (Optional): Specify the number of occurrence of sub-string to replace, Default: All Occurrence

Return Value: String

Returns a new string which is a copy of “original-string” with all or specified occurrence of old sub-string replaced with new sub-string 

Example:

# Python3 program to explain working of replace() method   
  
string = "Hello Stechies, Hello Python, Hello Programming, Hello Development" 
   
# Replace sub-string Hello with Hi  
print(string.replace("Hello", "Hi"))  
  
# Replace sub-string Hello with Hi only 3 occurrence   
print(string.replace("Hello", "Hi", 3))

# Check is replace() is case-sensitive
print(string.replace("hello", "Hi", 3))

Output: 

Hi Stechies, Hi Python, Hi Programming, Hi Development
Hi Stechies, Hi Python, Hi Programming, Hello Development
Hello Stechies, Hello Python, Hello Programming, Hello Development

Note: replace function is case-sensitive