var_args.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-


def hello(greeting, *args):
    if len(args) == 0:
        print("%s!" % greeting)
    else:
        print("%s, %s!" % (greeting, ", ".join(args)))


hello("Hi")  # => greeting='Hi', args=()
hello("Hi", "Sarah")  # => greeting='Hi', args=('Sarah')
hello(
    "Hello", "Michael", "Bob", "Adam"
)  # => greeting='Hello', args=('Michael', 'Bob', 'Adam')

names = ("Bart", "Lisa")
hello("Hello", *names)  # => greeting='Hello', args=('Bart', 'Lisa')