How to set default value for multiple inputs from one line in python

Question

I'm trying to get specifications three necessary inputs and a fourth optional one from one input in Python.

a, b, c, d = input("Please enter the number of the figure you would like and the x y coordinated in that order and a colour if you choose.").split()

I want d to be optional with a set default value but I'm really struggling with it.

Answer 1

# get input
inp = input("Please enter the number of the figure you would like and the x y coordinated in that order and a colour if you choose.").split()
# check how many parameters are passed
if len(input) == 3:
    # value for d is not passed
    a, b, c = inp
    d = default_value
else:
    # value for d is passed
    a, b, c, d = inp