Python Replace Character in String

Top 6 Best Methods of Python Replace Character in String

Python is one of the widely used programming languages globally, and therefore, programmers use it to perform various operations. Data cleaning and preprocessing is one of the major tasks for Python programmers. But Python Replace Character in String is critical because they need to deal with massive data. 

They face issues with spelling, formatting, garbage characters, and many more. They need to fix all these issues to process clean data for further processing. 

This blog will uncover some of the most popular and effective methods for Python to replace characters in the string. Before digging deep into the blog, let’s answer some of the common questions related to Python Replace Character in String. 

To replace a value in Python, we can use the string.replace() function to replace a string value in Python. Have a look at its syntax:-

string.replace(old, new, count)

In this function:-

  • Old: Old is the substring that you want to replace with the new one.
  • New: New is the substring that will take the place of the old substring
  • Count- Count in the number of times that you want to replace the old substring with the new substring(optional)
  • Return Value: It returns the copy of the string in all the occurrences of the substring that the new one will replace.

What is String in Python?

String in Python is nothing but the sequence of Unicode characters within the single quotes or double quotes. Or we can say that the combination of characters is a string in Python that is declared within a single or double quote.

In the case of multiline strings, we need to use triple quotes. And the best part of Python is that it doesn’t offer any “char” datatype to define a character you found on other programming languages.

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Therefore whenever you declare a single character in a string, it can be considered a single character. Remember that it is not possible to add, update or delete a string once it is declared because of its immutable nature. Therefore, if you want to modify a character piece, you need to create a copy of it and update it accordingly. 

Example of a string in Python

x=”Highly Skilled Python Programmers”
print(x)

Output

Highly Skilled Python Programmers

How to do Python Replace Character in String

Look at the top 6 most common and effective methods for python replace character in string . With the help of these methods, you can rectify your mistakes in the character of a string more easily than ever before, even if you are dealing with a massive amount of data. 

1. Using slicing method

One of the best methods for python replace character in string is the slicing method. It is used to access different parts of the data types sequence like string, lists, and tuples. With the help of this method, an index is used to replace a range of characters in a string.

For this, you need to specify the start and the end of the index separated by the colon and return a specific part of the string. In this, you need to select the character you will replace by the slicing method. And it will replace the old characters with new characters. Have a look at it:-

str = ‘Python programmers’
index = 7
new_char = ‘P’
str = str[:index] + new_char + str
[index+1:]
print(str)

Output

Python programmers

2. Using replace() method

Replace method is widely used in python replace character in string . It offers the easiest way to replace a character in a string. The replace() method replaces the occurrence of the given old character with the new character. Or we can say that it is quite easy to easily replace the old substring with the new substring.

It offers the simplest parameter like replace(old, new, count). This old is the character you want to replace, and the new is the character you want to replace with the old one. Other than that count is the number of times you want to replace the character in the string. Have a look at its example:-

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str = “Get Best Solution with python programmers”
title = str.replace(“p”, “P”, 2)
print(title)

Output

Get Best Solution with Python Programmers

3. Using the list data structure 

This approach is not as popular as replace() function for python replace character in string . In this method, you need to convert the given string into a list data type and then replace the character with the new character at the given index. In the end, you need to join the string together to form the actual string using the .join() function. Have a look at the example below to understand it more deeply:- 

str = ‘python Programmers’
index =
new_character = ‘P’
temp = list(str) 
temp[index] = new_character
str = “”.join(temp)
print(str)

Output

Python Programmers

4. Replace multiple characters with the same character

If you want to replace multiple characters in the given string with the new character, you need to use the string indexes function. In this, you need to use “for loop” to iterate through a string and find the given indexes. You also need to use the slicing method, i.e., used to replace the old character with the new character to get the final result. Have a look at the example to understand it better

str = ‘Pfogyammes’ 
indexes = [1, 4, 9
new_character = ‘r’ 
result = ” for i in indexes:    
str = str[:i] + new_character + str[i+1:] 
print(str)

Output

Programmer

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5. Replace multiple characters with different characters

If you have found the above method quite familiar for you for python replace character in string. Then, this method is also quite similar to the above. But it has a slight modification than the previous one. In the above, you can only replace different characters with the same character. But in this method, you can replace different characters with different replacement characters at the same time.

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For this, you need to use “For Loop” to iterate through string characters. And it will replace the string using the slicing method. Don’t get confused, have a look at the example below to understand it:-

str = ‘Pythnn Pfogrommer’
indexes = {4: ‘o’,           8: ‘r’,           12: ‘a’}
title = ” ”
for index, replacement in indexes.items():    
str = str[:index] + indexes[index] + str[index + 1:]
print(str)

Output

Python Programmer

6. Using Regex module

Python regex module is the best in class modules in python replace character in string. It specially handles text data to find substrings and then replace strings. Keep in mind that it is not a function that you can call anywhere in the Python program. It is the module that can replace the old characters with the new ones very effectively.

It holds three parameters i.e., re.variable(old, new, original). In this old is the old characters that need to be replaced, new is the replacement string for the old ones. And the original is used to declare the original string in which the substring needs to be replaced. Don’t get confused, have a look at the example below to understand it effectively:-

import relocation = ‘#211 P, Sec 7, Kurukshetra’
new_location = re.sub(‘Sec 7’, ‘Sector. 7’, location)
print(new_location)

Output

#211, Sector 7, Kurukshetra

Conclusion

This blog may have cleared all your doubts about how you can do python replace character in string . You can use any of them within your program for Python to replace characters in the string, and sometimes you need to modify them as well to get the desired results.

Therefore you need to invest enough time to understand and practice all these methods to get a good command over them. It will help you to deal with the massive amount of data in a faster and efficient way.

If you still have some doubts about Python Replace Character in String then comment down below. You can also ask us for the best Python programming help from our experts to get the best solution.

Frequently Asked Questions

How do you replace a character in a string in Python?

The easiest method to replace characters in a string in Python used by us is str.replace() function. Have a look at its example:-
x_string =”xyz”
X_string = x_string.replace(“x”,”y”) Replace in x_string.
print(x_string)

How do you replace all occurrences of a string in Python?

The best and most effective method to replace all occurrences in Python is to use the replace() function. It allows you to replace all occurrences most easily without any hassle. 

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