Web Reference: Definition and Usage The isupper() method returns True if all the characters are in upper case, otherwise False. Numbers, symbols and spaces are not checked, only alphabet characters. Jul 11, 2025 · isupper () method in Python checks if all the alphabetic characters in a string are uppercase. If the string contains at least one alphabetic character and all of them are uppercase, the method returns True. Otherwise, it returns False. Let's understand this with the help of an example: In the following example a string PYTHON is created with all the letters in upper case. The Python Sring isupper () method is then used to check whether the given string is in uppercase.
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