passing an argument to python method if not passed then consider the default code example

Example 1: python default arguments

def your_function(arg,kwarg='default'):
    return arg + kwarg

Example 2: default values python

class Test:
    def __init__(self, val, num = 0):
        self.val = val
        self.num = num

# you can write this:

t = Test(1)
print(t.num) # prints 0

# OR this

t = Test(1, 2)
print(t.num) # prints 2