how to put a parameter as optional in python functions code example

Example 1: python create a function with optional parameter

def some_function (self, a, b, c, d = None, e = None, f = None, g = None, h = None):
    #code

Example 2: optional arguments python

def some_function (self, a, b, c, d = None, e = None, f = None, g = None, h = None):
    #code