This post explains how to use loops in Python. You'll learn FOR loops, WHILE loops, BREAK, ... Here, you write “while” followed by a test statement, a colon, and a code block.

$ python iterator_test.py 463 926 1389 1852 Let’s take a look at what’s going on. We made our own class and defined a __next__ method, which returns a new iteration every time it’s called.