Working with files in Python is pretty easy. But there’s a common mistake that can sneak into your code. Not closing the file ...

Many programs have a need to iterate over a large list of generated data. The conventional way to do this would be to calculate the values for the list and populate it, then loop over the whole thing.

How to use “while” loops in Python The great thing about Python is that a lot of its statements sound like plain English, meaning you can guess what they do before you even learn!