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title: python string contains: a comprehensive tutorial with code examples
introduction:
in python, determining whether a string contains a specific substring is a common task. the in keyword and various string methods provide different ways to achieve this. this tutorial will guide you through different methods to check if a string contains another string in python, along with illustrative code examples.
method 1: using the in keyword
the in keyword is a simple and straightforward way to check if a substring exists in a string. it returns a boolean value indicating whether the substring is present or not.
method 2: using the str.find() method
the str.find() method returns the lowest index of the substring in the string. if the substring is not found, it returns -1.
method 3: using the str.index() method
similar to str.find(), the str.index() method returns the index of the first occurrence of the substring. however, if the substring is not found, it raises a valueerror.
method 4: using regular expressions (regex)
regex provides powerful pattern matching capabilities. the re module in python can be used for complex substring matching.
conclusion:
you have now learned multiple methods to check if a string contains another string in python. choose the method that best suits your specific requirements, and incorporate it into your code for efficient substring detection.
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