[python] Should I use "camel case" or underscores in python?

So which is better and why?

def my_function():

or

def myFunction():

Function names should be lowercase, with words separated by underscores as necessary to improve readability. mixedCase is allowed only in contexts where that's already the prevailing style

Check out its already been answered, click here

PEP 8 advises the first form for readability. You can find it here.

Function names should be lowercase, with words separated by underscores as necessary to improve readability.