Python | Remove the given substring from end of string

Sometimes we need to manipulate our string to remove extra information from the string for better understanding and faster processing. Given a task in which the substring needs to be removed from the end of the string using Python.   

Remove the substring from the end of the string using Slicing

In this method, we are using string slicing to remove the substring from the end.

Python3

text = 'GeeksforGeeksWorld'
sub = "World"

# find len of suffix
le = len(sub)

# slice out from string
text = text[:-le]
print(text)

Output:

GeeksforGeeks

Remove the substring from the end of the string using the Naive Method

In this method, we are using the Python loop and append method to remove the substring from the end.

Python3

# Initialising string
ini_string = 'xbzefdgstb'

# initializing string
sstring = 'stb'

# printing initial string and substring
print ("initial_strings : ", ini_string, "\nsubstring : ", sstring)

# removing substring from end
# of string using Naive Method
if ini_string.endswith(sstring):
    res = ini_string[:-(len(sstring))]

# printing result
print ("resultant string", res)

Output

initial_strings :  xbzefdgstb 
substring :  stb
resultant string xbzefdg

Remove the substring from the end of the string using sub() method

In this method, we are using string regex sub() to remove the substring from the end.

Python3

import re

# Initialising string
ini_string = 'xbzefdgstb'

# initializing string
sstring = 'stb'

# printing initial string and substring
print ("initial_strings : ", ini_string, "\nsubstring : ", sstring)

# removing substring from end
# of string using sub Method
if ini_string.endswith(sstring):
    res = re.sub(sstring, '', ini_string)

# printing result
print ("resultant string", res)

Output

initial_strings :  xbzefdgstb 
substring :  stb
resultant string xbzefdg

Remove the substring from the end of the string using replace() method

In this method, we are using the string replace() function to remove the substring from the end.

Python3

# Initialising string
ini_string = 'xbzefdgstb'

# initializing string
sstring = 'stb'

# printing initial string and substring
print ("initial_strings : ", ini_string, "\nsubstring : ", sstring)

# removing substring from end
# of string using replace Method
if ini_string.endswith(sstring):
    res = ini_string.replace(sstring, '')

# printing result
print ("resultant string", res)

Output

initial_strings :  xbzefdgstb 
substring :  stb
resultant string xbzefdg

Using rfind() and slicing

 rfind() returns the index of the last occurrence of the substring in the string. Then we slice the string from the beginning up to the index of the substring.

Python3

text = 'GeeksforGeeksWorld'
sub = "World"

# find the index of the substring
index = text.rfind(sub)

# slice out from the string
text = text[:index]
print(text)
#This code is contributed by Edula Vinay Kumar Reddy

Output

GeeksforGeeks

Time complexity: O(n), where n is the length of the string.
Auxiliary Space: O(1)