How to Check if a String Contains a Substring in Python?

How to Check if a String Contains a Specific Substring in Python?

Python provides a straightforward way to determine if a string contains a particular substring using the 'in' operator. This operator performs a membership test and returns True if the substring exists within the string, and False otherwise.

To use the 'in' operator, simply compare the substring with the string using the following syntax:

if "substring" in "string":
    # Code to execute if the substring is present
else:
    # Code to execute if the substring is not present

For example, if you have a string called 'somestring' and you want to check if it contains the substring 'blah', you can use the following code:

if "blah" in somestring:
    print("The substring 'blah' exists in the string.")
else:
    print("The substring 'blah' does not exist in the string.")

Note that the 'in' operator performs a case-sensitive comparison. If you need to perform a case-insensitive search, you can use the 'lower()' or 'upper()' methods to convert both strings to a specific case before comparing them.

By leveraging the 'in' operator, Python programmers can efficiently determine if a string contains a specific substring without resorting to complex regular expressions or string manipulation techniques.

The above is the detailed content of How to Check if a String Contains a Substring in Python?. For more information, please follow other related articles on the PHP Chinese website!