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Python isupper(), islower(), lower() and upper() methods

This python string tutorial help to learn some string methods(isupper(), islower(), lower() and upper()) with example.These methods are used to check string is uppercase, check string is lowercase, convert string to lowercase and string in uppercase.

https://www.pythonpip.com/python-tutorials/python-isupper-islower-lower-and-upper-methods/

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