Web Reference: Definition and Usage The upper() method returns a string where all characters are in upper case. Symbols and Numbers are ignored. Apr 26, 2025 · upper () method in Python is a built-in string method that converts all lowercase letters in a string to uppercase. This method is simple to use and does not modify the original string; instead, it returns a new string with the modifications applied. The Python string upper () method is used to convert all the lowercase characters present in a string into uppercase. However, if there are elements in the string that are already uppercased, the method will skip through those elements.
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