How to Replace Values in a List in Python? Last Updated : 04 Jan, 2025 Comments Improve Suggest changes Like Article Like Report Replacing values in a list in Python can be done by accessing specific indexes and using loops. In this article, we are going to see how to replace the value in a List using Python. We can replace values in the list in several ways. The simplest way to replace values in a list in Python is by using list indexing.Let’s take an example of replacing values in a list using list indexing. Python a = [10, 20, 30, 40, 50] # Replacing 30 to 99 a[2] = 99 print(a) Output[10, 20, 99, 40, 50] Let’s see other different methods to Replace Values in a List.Table of ContentUsing For LoopUsing While LoopUsing Lambda FunctionUsing Lambda FunctionIn this method, we use lambda and map function to replace the value in the list. map() is a built-in function in python to iterate over a list without using any loop statement. A lambda is an anonymous function in python that contains a single line expression. Here we gave one expression as a condition to replace value. Python a = [10, 20, 30, 40, 50] b = list(map(lambda x: 99 if x == 30 else x, a)) print(b) Output[10, 20, 99, 40, 50] Using For LoopWe can use for loop to iterate over the list and replace values in the list. We first find values in the list using for loop and if condition and then replace it with the new value. Python a = [10, 20, 30, 40, 50] for i in range(len(a)): if a[i] == 30: a[i] = 99 print(a) Output[10, 20, 99, 40, 50] Using While LoopWe can also use a while loop to replace values in the list. While loop does the same work as for loop. In the while loop first, we define a variable with value 0 and iterate over the list. If value matches to value that we want to replace then we replace it with the new value. Python a = [10, 20, 30, 40, 50] i = 0 while i < len(a): if a[i] == 30: a[i] = 99 i += 1 print(a) Output[10, 20, 99, 40, 50] Comment More infoAdvertise with us Next Article How to Replace Values in a List in Python? R rushi_javiya Follow Improve Article Tags : Python python-list Practice Tags : pythonpython-list Similar Reads Python Tutorial | Learn Python Programming Language Python Tutorial – Python is one of the most popular programming languages. It’s simple to use, packed with features and supported by a wide range of libraries and frameworks. Its clean syntax makes it beginner-friendly.Python is:A high-level language, used in web development, data science, automatio 10 min read Python Interview Questions and Answers Python is the most used language in top companies such as Intel, IBM, NASA, Pixar, Netflix, Facebook, JP Morgan Chase, Spotify and many more because of its simplicity and powerful libraries. 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