![]() If you want to convert a string list to all uppercase, check out this detailed tutorial on the Finxter blog. □ Recommended Tutorial: List Comprehension in Python - A Helpfull Illustrated Guide If you struggle with list comprehension, I’d highly urge you to watch the following explainer video and dive into the related tutorial: ![]() ![]() Here’s this method applied to our example strings: def all_lower(my_list): The result is a new string list, all lowercase. The most Pythonic way to convert a string list my_list to all lowercase strings is to use the str.lower() method inside a list comprehension expression like so. So, let’s get started with my most recommended solution first! □ Method 1: List Comprehension + str.lower() □ There are multiple great ways to accomplish this coding challenge and I strongly believe it’s a great learning tool to dive into each of them. Thanks for reading! Now you know how to use the lower() method in JavaScript.□ Question: How to convert a list of strings to all lowercase in Python? In this way it doesn't matter if the user writes "YELLOW" or "yELLOW" or "yellow" – it is all converted to lowercase. What changed? Writing answer.lower() you make sure that the checked string is completely lower case before comparing it with the correct answer string "yellow". Print("That is not the correct color!") the fixed sun_color.py fileĪnd now, if you try again. You can easily fix this by using the lower() method, and doing this small change to the sun_color.py file: answer = input("What color is the sun? ") The script is checking if the user input the string yellow – Yellow, with a capital "Y", is a different string. Remember that strings are case sensitive. If you answer "Yellow", it says: $ python sun_color.py Running this script, you will have this question asked in the terminal: $ python sun_color.py Then it checks if the answer is "yellow", and if it is it prints "Correct!" If it isn't, it prints "That is not the correct color!". This script asks the user a question, "What color is the sun?", and waits for an answer. Print("That is not the correct color!") the sun_color.py file answer = input("What color is the sun? ") Let's write a small script that asks the user a question and waits for input, and gives feedback about the user's answer. lower() method example: how to check if the user input matches In the example you will see how this feature makes the lower() method useful and necessary when building a script or program that deals with strings. This is useful when thinking about what the lower() method could be useful for. Strings are case sensitive, so a lowercase string is different than an uppercase string. 'i am a string!' Strings are case sensitive You'll need to save it in a variable if you want to use it again in your code. 'I am a String!' The lower() method returns a new string Checking the value of example_string still shows the original value. In the examples above, the lower() method has acted on the example_string but never changed it. The original string will stay unchanged after you use the lower() method. Strings are an immutable data type, which means they can't be changed. But there are a few things to keep in mind when using it. The lower() method does a pretty straightforward thing: it creates a new string were all the uppercase letters are now lowercase. 'freecodecamp' What to keep in mind when using the lower method Any lower case letter, or any character that is not a letter, is not affected. If the original string has uppercase letters, in the new string these will be lowercase. The lower() method is a string method that returns a new string, completely lowercase. Of these many string methods, in this article you will learn about the lower() method and how it works. In Python you can see the whole list of string methods by using the dir() function with a string as argument, like so: > dir(example_string) Sometimes you may wonder if a method exists. > example_string = 'I am a String!'Ī method is a function that can be used on a specific data type. A string is written as a series of characters between single or double quotes. What is a string?Ī string is a data type that can contain many different characters. In this article, we'll see how to make strings lowercase with the lower() method in Python. And the lower() method is one of the many integrated methods that you can use to work with strings. Strings are a fundamental part of working with Python.
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