How Can I Check if a Python String Contains a Substring?

Python String Contains Substring Method

In Python, there is no dedicated string.contains() or string.indexof() method for checking if a string contains a substring. However, there are alternative approaches to achieve this functionality.

Using the 'in' Operator

The 'in' operator can be used to test if a substring is present within a string. It compares the substring to the entire string and returns True if it is found.

if "blah" in some_string:
    # Code to be executed if "blah" is in some_string
else:
    # Code to be executed if "blah" is not in some_string

Note: The 'in' operator is case-sensitive.

Other Alternatives

• string.find() method: Returns the index of the first occurrence of the substring, or -1 if not found.

  index = some_string.find("blah")

• string.startswith() method: Checks if the string starts with the specified substring.

  if some_string.startswith("blah"):
    # Code to be executed if some_string starts with "blah"

• string.endswith() method: Checks if the string ends with the specified substring.

  if some_string.endswith("blah"):
    # Code to be executed if some_string ends with "blah"

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