Given a string, the task is to write a Python program to remove the last character from the given string.
Example:
Input: “GeeksForGeeks”
Output: “GeeksForGeek”Input: “1234”
Output: “123”
Explanation: Here we are removing the last character of the original string.
Note: Strings are immutable in Python, so any modification in the string will result in the creation of a new string.
Using list Slicing to Remove the Last Element from the string
The slicing technique can also remove the last element from the string. str[:-1] will remove the last element except for all elements. Here we are using the concept of slicing and then updating the original string with the updated string.
Python3
Str = "GeeksForGeeks"# using Positive indexingStr = Str[:len(Str)-1]print(Str)Str = "GeeksForGeeks"# using negative indexingStr = Str[:-1]print(Str) |
GeeksForGeek GeeksForGeek
Using loops and extra space to Remove the Last Element from the string
Here we are using some extra space i.e. O(N) and storing all the characters except for the last character.
Python3
Str = "GeeksForGeeks"a = ""for i in range(len(Str)-1): a += Str[i]print(a) |
GeeksForGeek
Time Complexity: O(n)
Auxiliary Space: O(n), where n is length of string.
Using rstrip() function to Remove the Last Element from the string
The rstrip() is a Python function that returns a string copy after removing the trailing characters.
Python3
Str = "GeeksForGeeks"Str = Str.rstrip(Str[-1])print(Str) |
GeeksForGeek
Using regex to Remove Last Element from string
Here we are using the concept of regular expression and removing the last character of the string.
Python3
import redef reg(m): return m.group(1)# sample stringStr = "GEEKSFORGEEKS"# Remove last character from stringnew_string = re.sub("(.*)(.{1}$)", reg, Str)print(new_string) |
GEEKSFORGEEK
Using list(),pop() and join() methods
Python3
#Python program to Remove Last character from the stringStr = "GeeksForGeeks"x=list(Str)x.pop()x="".join(x)print(x) |
GeeksForGeek
Using list comprehension and join method
Algorithm:
- Initialize the given string “Str”.
- Create a list “x” by iterating through each character in the string “Str” using a list comprehension.
- Remove the last character from the list “x” using the pop() method.
- Join the characters in the list “x” back to form a string and store it in “x”.
- Print the resulting string “x”.
Python3
#Python program to Remove Last character from the stringStr = "GeeksForGeeks"x = "".join([Str[i] for i in range(len(Str)-1)])print(x) |
GeeksForGeek
Time Complexity: O(n), where n is the length of the input string “Str”.
Auxiliary Space: O(n), where n is the length of the Out[ut string “x”.
