Finally, we can actually change the iterator – the number of steps taken on each loop. Code. Copy Text for x in range(2, 20, 3): ... How to use “while” loops in Python.

$ 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.

Note: We use the same examples to demonstrate how to use for loops and while loops. However, for some situations, using while loops may be more appropriate than using for loops or vice versa. It is ...

How to Read Multiple Files in a Loop in Python. ... Create a variable to store the file contents. This variable will store the text of the file for each iteration.