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. First, let's review the basic usage. This example uses the upper()method to convert all characters to uppercase, but the other methods work similarly. In Python, string objects (str) are immutable; thus, the original string remains unmodified. If you want to use the converted string later, you can assign it to a new variable like this: You can also...
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