Python String upper() Method Last Updated : 26 Apr, 2025 Comments Improve Suggest changes Like Article Like Report 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. Example: Python s = "learn python with gfg!" res = s.upper() print(res) OutputLEARN PYTHON WITH GFG! Explanation:The upper() method converts all the lowercase letters to uppercase and returns a new string.The original string 's' remains unchanged.Syntax of upper() method string.upper() Parameters:The upper() method does not take any parameters.Return Type: This method returns a new string in which all lowercase characters in the original string are converted to uppercase. If the original string has no lowercase letters then it returns the string unchanged.Example of upper() method1. Standardizing case for comparisonLet's consider a scenario where we want to compare two strings without considering their case. The upper() method can help us standardize both strings to uppercase before comparison. Python s1 = "Python" s2 = "PYTHON" # Using upper() for comparison res = s1.upper() == s2.upper() print(res) OutputTrue ExplanationThe upper() method converts both s1 and s2 to uppercase.The comparison s1.upper() == s2.upper() evaluates to True as both strings become "PYTHON".2. Handling mixed-case stringsupper() method is also very useful when we have a string with a mix of lowercase and uppercase letters, and we want to convert all characters to uppercase. Python # Converting mixed-case string to uppercase s = "PyThoN is FuN" res = s.upper() print(res) OutputPYTHON IS FUN ExplanationThe upper() method processes the string 's' and converts all lowercase letters to their uppercase equivalents.Non-alphabetic characters like spaces remain unchanged. Comment More infoAdvertise with us Next Article Python String upper() Method A Akanksha_Rai Follow Improve Article Tags : Python python-string Python-string-functions Practice Tags : python Similar Reads Python String partition() Method In Python, the String partition() method splits the string into three parts at the first occurrence of the separator and returns a tuple containing the part before the separator, the separator itself, and the part after the separator. Let's understand with the help of an example:Pythons = "Geeks gee 3 min read Python String replace() Method The replace() method replaces all occurrences of a specified substring in a string and returns a new string without modifying the original string.Let’s look at a simple example of replace() method.Pythons = "Hello World! 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