Python String Substring Search: When to Use the `in` Operator vs. Other Methods?

Python's String Substring Detection: in Operator vs. contains and indexof Methods

While Python lacks explicit string contains or indexof methods, it offers an efficient alternative for substring detection: the in operator.

Using the in Operator:

To check if a substring exists within a string, use the in operator as follows:

if "blah" not in somestring:
    continue

If "blah" is not found within somestring, the conditional expression evaluates to True, and the loop iteration continues. Note that the in operator performs a case-sensitive search. To ignore case, convert the strings to lowercase or uppercase before comparing.

Drawbacks of the in Operator:

While the in operator is efficient, it may not be suitable for certain scenarios where the substring needs to be found at a specific index or if you need to access the substring itself.

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