Lisp function to convert string to list11/24/2023 ![]() (do* ((stringstream (make-string-input-stream str)) Here is an example of code to convert a string to a list: ![]() If the objective is to parse the input, it is much more convenient to have a list of words than a string. For example, to get substantial input, read-line is most convenient, but it returns a string. Sometimes it is useful to convert text strings to lists. ![]() In the process of solving this problem, we’ve learned many new Python features that every Python pro coder should know without using Google.Next: FunctionsLambda Expressions, Up: Input and Output Previous: Input and Output Loop over all x and call list.append(x.lower()).You’ve learned three main ways to convert a list of strings to a list of lowercase strings: □ Recommended Tutorial: Python List Append Method Summary Feel free to check out our full guide on list.append() with many interesting factoids such as which is faster: list.append() or list.extend()? It’s not so bad-mainly due to the efficiency of the list.append() method. Here’s a minimal example: def all_lower(my_list): The default but not so idiomatic way to convert a string list to a lowercase string list is to create an empty list and iterate over all elements in the original list, converting each element to a lowercase string using x.lower() and appending this element to the newly-created list. □ Recommended Tutorial: Python Map Function Method 3: Simple For Loop and List Append □ If you struggle with the map() function, I’d recommend you check out the following video and blog tutorial: Return list(map(lambda x: x.lower(), my_list))Īn even more concise variant of this is to pass the str.lower() method object right as a first argument of the map() function like so: def all_lower(my_list): ![]() Here’s an example on the same sample lists: def all_lower(my_list): The result is a map object that you can convert to a list using the list() built-in function. Method 2: Map Function + String Lower □Ī concise Python one-liner to convert a string list to all lowercase strings is to use the map() function with a lambda function as a first argument - converting a string argument x to its lowercase variant using x.lower() - and the list of strings as the second argument. ![]() 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. □ Question: How to convert a list of strings to all lowercase in Python? ![]()
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