Web Reference: 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: Learn how to use the isupper() method to check if a string contains only uppercase letters. See syntax, parameters, return value, and examples of the isupper() method in Python.
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