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A Python string is a combination of characters enclosed in double or single quotes. Python provides multiple functions to manipulate strings. This article will show you different ways to remove the last character and specific characters from a string.

Remove the last character from a string using slice method in Python

Let's take the following code as an example.

my_str = "python string"
final_str = my_str[:-1]
print(final_str)

Python string indexing starts at 0. Python also has negative indexing to -1represent the last element. The slice operator accesses the last element of a string and removes it.

The output of the slice method is.

python strin

Python string last 3 characters using negative index method to delete

We can use negative indexes in Python. The last character starts at index -1 and goes through -2, -3, -4 and so on to reach the first character.

The code is:

my_str = "python string"
final_str = my_str[:-3]
print(final_str)

Output:

python str

Python string last 3 characters removed using slicing and forward indexing

len()Function determines the length of a string. The method selects the elements from the starting position 0 to the last position N and subtracts the last 3 characters, which is (N-3).

The first argument of the sharding method defaults to 0.

Its code is

my_str = "python string"
size = len(my_str)
final_str = my_str[: size - 3]
print(final_str)

Output:

python str

forHow to remove the last 3 characters of a Python string using a loop

We loop over all string characters, starting from the first index 0 to the last index (N-1), and delete the last 3 characters of the string.

The code is

my_str = "python string"
n = 3
final_str = ""
for i in range(len(my_str) - n):
    final_str = final_str + my_str[i]
print(final_str)

Output:

 python str

Python string last 3 characters removed using regular expression method

This method is used in Python to compare two groups. We use a built-in relibrary called which can check for a specific pattern in a string.

The code is:

import re


def rmve_2nd_grp(b):
    return b.group(1)


my_str = "Python String"
result = re.sub("(.*)(.{3}$)", rmve_2nd_grp, my_str)
print(result)

In the code, sub()the method compares the defined pattern and passes similar objects to rmve_2nd_grp()the method. The matched objects have two groups, but rmve_2nd_grp()compares the characters in group 1 and returns the string.

Output:

Python Str

Remove the last character from a Python string using regular expressions

If you need to remove the last character, use the following code.

import re


def rmve_2nd_grp(b):
    return b.group(1)


my_str = "Python String"
result = re.sub("(.*)(.{1}$)", rmve_2nd_grp, my_str)
print(result)

Output:

Python Strin