[Introduction to Udemy Python3 + Application] 50. Positional arguments, keyword arguments, and default arguments

** * This article is from Udemy "[Introduction to Python3 taught by active Silicon Valley engineers + application + American Silicon Valley style code style](https://www.udemy.com/course/python-beginner/" Introduction to Python3 taught by active Silicon Valley engineers + application + American Silicon Valley style code style ")" It is a class notebook for myself after taking the course of. It is open to the public with permission from the instructor Jun Sakai. ** **

■ Positional arguments

positional_argument


def menu(food, drink, dessert):
    print('food =', food)
    print('drink =', drink)
    print('dessert = ', dessert)

menu('beef', 'wine', 'ice cream')

result


food = beef
drink = wine
dessert =  ice cream

This time it is entered properly, but drink to ʻice cream, I dare to mistake dessert for wine`.

argument


def menu(food, drink, dessert):
    print('food =', food)
    print('drink =', drink)
    print('dessert =', dessert)

menu('beef', 'ice cream', 'wine')

result


food = beef
drink = ice cream
dessert = wine

I want to prevent such mistakes.

■ Keyword arguments

keyword_argument


def menu(food, drink, dessert):
    print('food =', food)
    print('drink =', drink)
    print('dessert =', dessert)

menu(food='beef', dessert='ice cream', drink='wine')

result


food = beef
drink = wine
dessert = ice cream

By setting the keyword argument, it was printed properly without writing in order.

■ Default arguments

default_argument


def menu(food='beef', drink='wine', dessert='ice cream'):
    print('food =', food)
    print('drink =', drink)
    print('dessert =', dessert)

menu()

result


food = beef
drink = wine
dessert = ice cream

If you set the default arguments and pass no arguments The set default argument is returned.

default_argument


def menu(food='beef', drink='wine', dessert='ice cream'):
    print('food =', food)
    print('drink =', drink)
    print('dessert =', dessert)

menu(food='chicken', drink='orange juice')

result


food = chicken
drink = orange juice
dessert = ice cream

After setting the default arguments If you pass keyword arguments only for those you want to change from the default arguments, Only that part is changed and returned.

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