Web Reference: May 3, 2025 · Python provides several built-in string methods to work with the case of characters. Among them, isupper(), islower(), upper() and lower() are commonly used for checking or converting character cases. In this lesson, we’ll dive into some advanced string methods in Python that help you check the properties of a string. These methods are particularly useful when validating input, such as checking whether a password meets certain security requirements. 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.
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