Lambda, Map, and Filter: Functional Python Explained

You know how to build lists with comprehensions now. doubled = [ n * 2 for n in numbers ] evens = [ n for n in numbers if n % 2 == 0 ] Clean. Readable. Good. Now you are going to see the older way Python does the same things. Not because it is better. Because you will absolutely see this code in tutorials, libraries, and other people's projects. If you do not know what lambda , map , and filter are, that code will confuse you. Lambda: A Function With No Name A regular function needs a name, a de