python optional parameter with default value 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: python function parameters default value

def F(a, b=None):
    if b is None:
        b = []
    b.append(a)
    return b