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Methods on How to Replace Multiple Characters in A String in Python - TutoPal

Methods on How to Replace Multiple Characters in A String in Python

Python is a versatile language for developing applications and web pages by programmers. It is a programming language used all over the world for programming various projects. It is a user-friendly language as it is written in English, and that’s the reason it is easy to learn and code. When you are learning a language or trying to work on a project or assignment, you must be needing help. Today, we discuss how to replace multiple characters in a string in python.

It is a mini project, though it needs to be understood well so that you can code well when using it as a part of your project. The project is just tricky but not as difficult as it seems. We will help you with how you can simply replace multiple characters. Check out how you can do this

How to Replace Multiple Characters in A String in Python

In order to successfully replace multiple characters in a string, we have a few methods that can help you replace them easily. Have a look at the methods

We are going to replace the character this way:

  • Replace ‘p’ with ‘P’
  • Replace ‘s’ with ‘S’
  • Replace ‘a’ with ‘A’

Method 1 – Use replace()

To replace the sub-strings in a string, Python has a String class (Str). This class offers the replace (old, new) method. It works to replace the old with the new sub-string. There is no existence of character data type in Python as a character is also a string. Let’s check out how to use the replace method

sample_string = "Replace multiple characters in a string"
char_to_replace = {'p': 'P',
                                    's': 'S',
                                    'a': 'A'}
# Iterate over all key-value pairs in dictionary
for key, value in char_to_replace.items():
# Replace key character with value character in string
sample_string = sample_string.replace(key, value)
print(sample_string)

Output

RePlAce MultiPle chArActers in A String

Method 2 – Use translate()

In this method, we replace multiple characters using translate(). With the help of the Str.maketrans(), a translation table from a dictionary is created, which is passed as an argument to the method translate().

sample_string = "Replace multiple characters in a string"
char_to_replace = {'p': 'P',
                                    's': 'S',
                                    'a': 'A'}
# Replace all multiple characters in a string
# based on translation table created by dictionary
sample_string = sample_string.translate(str.maketrans(char_to_replace))
print(sample_string)

Output

RePlAce MultiPle chArActers in A String

Method 3 – Use regex

Regex or better known as RegEx is an acronym of Regular expression. It is one of the methods to replace multiple strings in a simpler way. A correspondence is created with the white space. You need to use Re.sub() to extract that. Check how to use this method

import re
sample_string = "Replace multiple characters in a string"
char_to_replace = {'p': 'P',
                                    's': 'S',
                                    'a': 'A'}
# Replace multiple characters (s, a and i) in string with values in
# dictionary using regex
sample_string = re.sub(r"[sai]",
lambda x: char_to_replace[x.group(0)],
sample_string)
print(sample_string)

Output

RePlAce MultiPle chArActers in A String

Conclusion

In this post, we shed light on the method to help you understand how to replace multiple characters in a string in python. You can use the method you want or you can even try them all one by one.

I hope you find it helpful!

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