What is pep 8?

Answer 1

All you had to do is a very little research on google, stop being lazy.
PEP 8 is Python's style guide. It's a set of rules for how to format your Python code to maximize its readability. Writing code to a specification helps to make large code bases, with lots of writers, more uniform and predictable, too.

Answer 2

As Aymane Boukrouh said:

http://lmgtfy.com/?q=pep8

Answer 3

Python Enhanced Proposal 8 (PEP 8) provides standards and guidelines of how best to write python code