How Can I Efficiently Remove a String Suffix in Python?

How Can I Efficiently Remove a Substring from the End of a String?

Problem:

Given a string like "abcdc.com", we want to remove the ".com" suffix. However, using strip('.com') leaves us with "abcd" instead of the desired "abcdc".

Python 3.9 Solution:

Python 3.9 introduced the removesuffix method, which cleanly removes specified substrings from the end of a string:

url = 'abcdc.com'
url.removesuffix('.com')  # Outputs: 'abcdc'

Python 3.8 and Older Solutions:

In earlier Python versions, several alternative methods exist:

• endswith and Slicing: Check if the string ends with ".com" and slice it off if necessary:

url = 'abcdc.com'
if url.endswith('.com'):
    url = url[:-4]  # Remove four characters from the end

• Regular Expression: Use a regular expression to search and replace the ".com" suffix:

import re
url = 'abcdc.com'
url = re.sub('\.com$', '', url)

Considerations:

• strip strips any character in the specified set from the beginning or end of the string.
• removesuffix only removes the specified suffix from the end of the string.
• re.sub can search and replace any specified substring, but it can be more complex for simple replacements.

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