How Do I Replace Substrings in Python 3.x?

How to Replace Substrings in Python 3.x

Introduction:

Python's string.replace() method was deprecated in Python 3.x. This article explores the new and recommended approach for replacing substrings in Python 3.

New Method: Using str.replace()

As in Python 2.x, Python 3.x provides the str.replace() method as the replacement for string.replace(). It follows the same syntax and behavior:

original_string.replace(old_substring, new_substring, count)

• original_string: The string to perform the replacement on.
• old_substring: The substring to be replaced.
• new_substring: The substring to replace with.
• count (optional): An integer specifying the maximum number of occurrences of old_substring to replace (default is unlimited).

Example:

To replace the word "world" with "Guido" in the string "Hello world":

>>> 'Hello world'.replace('world', 'Guido')
'Hello Guido'

Additional Notes:

• str.replace() returns a new string with the replacements applied, while the original string remains unchanged.
• If old_substring is not found in the string, the original string is returned.
• Specifying count ensures that only a certain number of occurrences of the substring are replaced. For example, replace the first two occurrences of "is" with "are":

>>> 'This is is is not is a test'.replace('is', 'are', 2)
'This are are is not is a test'

The above is the detailed content of How Do I Replace Substrings in Python 3.x?. For more information, please follow other related articles on the PHP Chinese website!