How to remove the last character from a string in Python

In this Python tutorial, we are going to discuss how to remove the last character from a string in Python. Also, we will demonstrate Seven interesting techniques to remove the last character from a string in Python.

• How to remove the last character from a string in Python
• How to remove the last character from a string in Python by using the slicing method
• How to remove the last character from a string in Python by using the translate method
• How to remove the last character from a string in Python by using the rstrip method
• How to remove the last character from a string in Python by using the regex method
• How to remove the last character from a string in Python by using the for loop concept
• How to remove the last character from a string in Python by using the join and list comprehension method
• How to remove the last character from a string in Python by using the replace() method
• How to remove the last character from the string Python NumPy

How to remove the last character from a string in Python by using the slicing method

• Here we will try to understand how to remove the last character from a string in Python by using the slicing method.
• String slicing is a Python technique for removing the last character from a string. You can get a substring by using the string-slicing function. To extract certain characters from the string, indexing is utilized.
• In this example, we will use the negative index by slicing to remove the last character from the string.

Syntax:

str[:-1]

Example:

Let’s examine an example to help you better understand the concept.

# Input string
Country_name = " The United States of America"
print("Input string: ", Country_name)

# By using the slicing negative index
result = Country_name[:-1]

# Display the Content
print("Last character has been removed from string: ", result)

Here we have taken an input string Country_name = ” The United States of America” and then for removing the last character from a string the indexing starts from -1.

We have removed the last character of the string by slicing it at the -1 index. Finally, the result has been printed. Therefore, we can see that the last character has been removed.

You can refer to the below Screenshot.

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How to remove the last character from a string in Python by using the translate method

• In this example, we will discuss how to remove the last character from a Python string by using the translate method.
• The translate() function of Python is used to return a string in which each character is mapped to its associated position in the translation table.
• To remove a character from the result string, we must give the character’s Unicode code point and the word “None” as a replacement. To determine a character’s Unicode code point, we can utilize the ord() method.

Example:

# Input string
cities_of_USA = 'New York, Los Angeles, California'
print("Input string:",cities_of_USA)

# Using the translate() method
new_output= cities_of_USA.translate({ord('a'): None})

# Display the Content
print("Last character removed: ", new_output)

Here is the implementation of the following given code

In this example, we have discussed how to remove the last character from a string in Python by using the translate method.

Read: How to Sum Elements in List in Python using For Loop

How to remove the last character from a string in Python by using the rstrip method

• The characters on the right side of the given string are removed using the string function rstrip. Therefore, we’ll use it to get remove the string’s last character. 
• The rstrip() method strips the string’s last few characters of the provided following characters. It removes the trailing whitespaces at the end if no argument is provided.

Syntax:

Let’s have a look at the Syntax and understand the working of the rstrip() method in Python.

string.rstrip(chars)

Note: It consists of only one parameter that indicates the trailing character to be removed.

Example:

new_val = input("Enter the Country name : ")
 
new_output = new_val.rstrip(new_val[-1])
 
print("Last character removed from String : ",new_output)

You can refer to the below Screenshot

This is how to remove the last character from a string in Python by using the rstrip method.

Read: How to find perfect number in Python

How to remove the last character from a string in Python by using the regex method

• Regex() is a Python function that can be used to match two groups in a string. The regex module’s ‘re’ class has the function re.sub(). The last character can also be removed using it. 
• Re.sub() is a method provided by Python regex that searches and replaces patterns in a string. By using this technique, we can substitute a different string for one or more instances of a regex pattern found in the objective string.

Syntax:

Let’s have a look at the Syntax and understand the working of the re.sub() method in Python.

re.sub(pattern, repl, string, count=0, flags=0)

• It consists of a few parameters
  • pattern: This parameter defines the string/pattern that we want to be replaced.
  • repl: This parameter is used to define the pattern with which the pattern is replaced.
  • Count: By default, it takes a 0 value and it defines the number of replacements that should occur.

Example:

For a better comprehension of the idea, let’s look at an example.

Source Code:

import re
# input string
Country_name = "U.S.A, France, Belgium"

# By using the re.sub() method
new_output = re.sub(r'm', '', Country_name, count = 1)

# Display the content
print("Removed last character from input string: ",new_output)

As a result, we will import the re library first to verify that the function, which is found in the re module, and Then, we produce a string.

The re.sub() command is then executed, with the parameters string and count passed in it. Here, we utilize the expression “count=1” to indicate that character removal and within this function, we passed the alphabet which we want to remove from the input string.

Here is the implementation of the following given code.

As you can see in the Screenshot we have discussed How to remove the last character from a string in Python by using the regex method.

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How to remove the last character from a string in Python by using the for loop concept

• The last character in the string can also be removed using a for loop. The len() function will be used to extract the string’s length.
• Next, an empty string will be generated. After that, we will append the string to the empty string by iterating through the loop from 0 to l-2.
• The output will then be printed as the final string.

Example:

Let’s take an example and check how to remove the last character from a string in Python.

Source Code:

# Input string
Companies_in_USA = "Walmart, Amazon, Apple"
print("Input string: ",Companies_in_USA )

# Calculate string length
new_length = len(Companies_in_USA)
 
#empty string
new_string = ""
 
# By using for-loop
for i in range(0,new_length-1):
    new_string = new_string + Companies_in_USA[i]
 
print("Remove last Character : ",new_string)

In this case, we have first taken the input string Companies_in_USA = “Walmart, Amazon, Apple” and then we have used the len() function to determine the length of the string.

In order to create the new string, we took an empty string and appended it to the existing string. Next, we added the character from the empty string to each iteration of the for loop, which we used to go from index 0 to new_length-1.

We have finally printed the finished string that was created and it will display the last character that has been removed from the input string.

Here is the implementation of the following given code.

This is how to remove the last character from a string in Python by using the for loop concept.

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How to remove the last character from a string in Python by using the join and list comprehension method

• Here we will discuss how to remove the last character from a string in Python by using the join and list comprehension method in python.
• By using the list comprehension and join method we can easily involve splitting each string element into its associated list element, then joining each of them to declare a new string.

Example:

Here we will take an example and check how to remove the last character from a string in Python by using the join and list comprehension method in python.

Source Code:

# Input string
state_name_in_USA = 'Alaska'
print ("Original string: ", state_name_in_USA)

# By using the join() method 
new_result = ''.join([state_name_in_USA [m] for m in range(len(state_name_in_USA )) if m != 5]) 

# Display the Content   
print ("Last character remove from string: ",new_result) 

In the following given code first, we created an input string named “state_name_in_USA” and within this, we assigned the state name to it. Next, we used the join() method and iterate the values with a set condition if i !=5 and it will remove the last character from a string.

Here is the Screenshot of the following given code

As you can see in the Screenshot we have discussed how to remove the last character from a string in Python by using the join and list comprehension method.

Read: Complex Numbers in Python

How to remove the last character from a string in Python by using the replace() method

• In this example, we are going to understand how to remove the last character from a string in Python by using the replace() method in Python.
• A built-in function in Python called replace() creates a new string by replacing one substring with another.
• In this example, if we want to remove the last character from the input string then we have to provide the second parameter as an empty string ‘ ‘.

Syntax:

Let’s have a look at the syntax and understand the working of the str.replace() method in Python.

str.replace(old,  new, count)

• It consists of a few parameters
  • old:- This parameter defines the string which will be replaced.
  • new:- Replace the existing value with a new one (a character or a string).
  • count:- an integer value that indicates how many instances of the old character or substring you want to replace with the new one. It is an optional parameter.

Example:

# Input string
Cars_in_USA = 'Tesla, BMW'

# By Using replace() method
new_output= Cars_in_USA.replace('W', '')

# Display the content
print("Last character has been removed from string: ",new_output)

In the following given code, we used the str.replace() function, and within this method, we have provided the old character ‘W’ and replaced it with a new character but in this case, we have to remove the character so, the second parameter will be an empty string.

You can refer to the below Screenshot

In this example, we have understood how to remove the last character from a string in Python by using the replace method in Python.

Read: Python Palindrome Program

How to remove the last character from the string Python NumPy

• In this section, we will discuss how to remove the last character from the string in NumPy Python.
• To perform this particular task we are going to use the numpy.char.replace() function. With the old substring replaced by the new substring in every instance, the replace() function returns a copy of the string or array of strings.
• When you want to replace a substring in an array element with a new string value, this function is extremely useful.

Syntax:

Here is the Syntax of numpy.char.replace() function in Python

numpy.char.replace(a, old, new, count=None)

• It consists of a few parameters
  • a: This parameter defines the input array in which we insert the string elements.
  • old: The original substring that you want to replace is specified by this parameter.
  • new: This parameter defines the new substring used to replace the old substring.

Example:

import numpy as np

# Creation of input array
Country_name = np.array([" The United States of America"])

# Create old character
old = "a"

# creating a new character
new = " "

# By using the char.replace() function
new_result = np.char.replace(Country_name, old, new)
print("last character removed from array: ",new_result)

Here is the Screenshot of the following given code

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• Python dictionary append
• Python program for finding greatest of 3 numbers

In this tutorial, we have discussed how to remove the last character from a string in Python, and also we have applied different techniques to remove the last character from a string in Python.

• How to remove the last character from a string in Python
• How to remove the last character from a string in Python by using the slicing method
• How to remove the last character from a string in Python by using the translate method
• How to remove the last character from a string in Python by using the rstrip method
• How to remove the last character from a string in Python by using the regex method
• How to remove the last character from a string in Python by using the for loop concept
• How to remove the last character from a string in Python by using the join and list comprehension method
• How to remove the last character from a string in Python by using the replace() method
• How to remove the last character from the string Python NumPy