Web Reference: Definition and Usage The islower() method returns True if all the characters are in lower case, otherwise False. Numbers, symbols and spaces are not checked, only alphabet characters. Jul 11, 2025 · The islower () method in Python checks if all characters in a string are lowercase. It returns True if all alphabetic characters are lowercase, otherwise, it returns False, if there is at least one uppercase letter. Let's look at a quick example of using the islower () method. The islower () method is a built-in string method in Python. It returns True if all characters in the string are lowercase and there’s at least one lowercase character.
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