The Python string replace function is one of the String Method. This Python replace string function is used to replace all occurrence of an existing string or character(s) with a new substring.
In this article we will show you, How to replace string in Python Programming with example.
Python Replace Syntax
The basic syntax of the Python replace function is as shown below:
String_Value.replace(old_string, new_string, count)
- String_Value: Please select a valid String literal.
- Old_string: Specify the substring that you want to replace.
- New_string: This is the new substring that would replace the Old_string.
- Count: This is an optional argument. Specify the number of times you want to replace the old_string with new_string. If you Omit this parameter, Python replace Function will replace all occurrence of old_string with new_string.
Python Replace String Example
This is a simple example of this replace function. Here, we are replacing l with M, o with A and o with ABC from Hello World
'Hello World'.replace('l', 'M')
'Hello World'.replace('o', 'A')
'Hello World'.replace('o', 'ABC')OUTPUT
In this example, we are using this python string replace function to replace all occurrence of t with X. Remember, replace function replaces case sensitive. It means, it will replace only t characters, not T.
# Python String Replace Example
string = 'Tutorial Gateway Provides Python Programming Tutorial'
x = string.replace('t', 'X')
print(x)OUTPUT
This is an extension to the above example. Within the first statement, we are replacing t with X. In the second statement, a was replaced by W. Next, the third statement replace e with Z.
string = 'tutorial gateway provides python programming tutorial'
print(string)
x = string.replace('t', 'X')
print(x)
y = string.replace('a', 'W')
print(y)
z = string.replace('e', 'Z')
print(z)OUTPUT
Python String Replace Multiple Characters Example
In this example, first, we are replacing tutorial with Alpha. Next, we are replacing pro with Di and assigned the result to y.
string = 'tutorial gateway provides python programming tutorial'
print(string)
x = string.replace('tutorial', 'Alpha')
print(x)
y = string.replace('pro', 'Di')
print(y)OUTPUT
Python Replace Character in String at index Example
In this example, we are using this Python replace function along with count argument. It means, function will replace the text for specified number of times.
Here, y replace the tutorial with tutorialgateway for one time.
text = 'tutorial provides python programming tutorial'
print(text)
print()
x = text.replace('tutorial', 'TutorialGateway')
print(x)
y = text.replace('tutorial', 'TutorialGateway', 1)
print(y)OUTPUT
In this example, the second statement replaces the first occurrence of abc with XYZ. The third statement replaces the first two occurrence of abc with substring XYZ. And the fourth statement replaces the first three instance of abc with XYZ.
string = 'we are abc working at abc company in abc position'
print(string)
x = string.replace('abc', 'XYZ')
print(x)
y = string.replace('abc', 'XYZ', 1)
print(y)
z = string.replace('abc', 'XYZ', 2)
print(z)
m = string.replace('abc', 'XYZ', 3)
print(m)OUTPUT
Practical Python Replace Example
This program allows the user to enter the string, string to be replaced, and the new string to replace with. Next, we used the replace function to replace the old string with new.
string = input("Please enter any String : ")
old_string = input("Please enter the String to replace : ")
new_string = input("Please enter the new String : ")
x = string.replace(old_string, new_string)
print(x)
y = string.replace(old_string, new_string, 1)
print(y)
z = string.replace(old_string, new_string, 2)
print(z)OUTPUT
Python Replace Backslash
This is one of the frequently asked question. In this example, we are using Python string replace function to replace Backslash with forward-slash, : and Hello word.
# Python string replace Backslash Example
text = r'C:\Programs\Python Programs\xyz.txt'
x = text.replace('\\', '/')
print(x)
print()
y = text.replace('\\', ':')
print(y)
print()
z = text.replace('\\', 'Hello')
print(z)OUTPUT
This is an another example of replacing backslash. Here, we used the third argument (count) to restrict the replacing times.
text = r'C:\Programs\Python\Python Programs\xyz.txt'
x = text.replace('\\', '/', 1)
print(x)
print()
y = text.replace('\\', '/', 2)
print(y)
print()
z = text.replace('\\', '?', 3)
print(z)
print()
a = text.replace('\\', ' Hi ', 3)
print(a)OUTPUT
Python Replace Backslash with Double slash
This example replace the backslash in a given text with double-slash
# Python string replace Backslash with Double Backslash Example
text = r'C:\Programs\Python\Python Programs\xyz.txt'
print(text)
print()
x = text.replace('\\', '\\\\')
print(x)OUTPUT
Python Replace Regex
The Python string replace function can search and replace one at a time. However, you can use the regex sub function to search for multiple characters or substrings and replace them at a time.
import re
text = 'Hello World'
print(text)
print()
x = re.sub('l', 'X', text)
print(x)OUTPUT
The below program search for t and a inside a text variable and replace them with k and ABCD.
import re
text = 'tutorial gateway'
print(text)
print()
x = re.sub('[ta]', 'K', text)
print(x)
y = re.sub('[ta]', 'ABCD', text)
print(y)OUTPUT
This is another approach of using the regular expression or regex.
import re
text = 'python programming tutorial gateway'
print(text)
print()
x = re.sub('t|a', '', text)
print(x)
y = re.sub('t|a|g', ' ', text)
print(y)OUTPUT
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