Web Reference: 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. The islower () method checks if all cased characters in a string are lowercase. It returns True only if all cased characters are lowercase AND there is at least one cased character.
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