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. Definition and Usage The upper() method returns a string where all characters are in upper case. Symbols and Numbers are ignored. Jan 15, 2011 · There's a string of all uppercase ASCII characters built into Python: from string import ascii_uppercase. Doing it this way is likely faster than calling isupper on every letter, but I haven't timed it.
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