Python String isupper() is an inbuilt function that returns “True” if all the characters in the string are uppercase.  Python String islower() is an inbuilt function that returns “True” if all the characters in the string are lowercase. These are the built-in method used for string handling.

Python String isupper islower upper lower

Python isupper() method returns “True” if all the characters in the string are uppercase; otherwise, It returns “False.”

Python islower() method returns “True” if all the characters in the string are lowercase; otherwise, it returns “False.”

Python upper() method returns the uppercased string from the given string. It converts all lowercase characters to the uppercase.

Python lower() method returns the lowercased string from the given string. It converts all uppercase characters to the lowercase.

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