Functions

Python Functions syntax is like:

def person_data(name, age, current_year=2019):
    """function doc string, this function return year of birth"""
    born_on = current_year - age
    return "{} born on {}".format(name, born_on)

In this function name and age are Required-Arguments and current_year is Optional-Argument with default value. this function can be called like:

person_data("Abolfazl", 24, 2020) # name, age and current_year are given
person_data("Abolfazl", 23) # current_year keep it’s default value 2019
person_data(age=23, name="Abolfazl") # name and age are given as keywords

Also arguments can be sent like tuples or dictionaries too:

def print_arguments(arg, *args, **kwargs):
    print("arg = ", arg)
    print("args = ", args)
    print("kwargs = ", kwargs)
print_arguments(1, 2, 3, 4, name="Abolfazl", family="Amiri")

The output would be:

arg = 1
args = (2, 3, 4)
kwargs = {'name': 'Abolfazl', 'family': 'Amiri'}