Convenient argument passing technique in Python (tuple, dictionary type)

A handy trick when passing arguments to a function in Python

Assuming you are sending a string, when you send an argument to the function The method of receiving by variable, tuple type, dictionary type is as follows.

function.py

# ****************
# *  2020.07.08
# *   ProOJI
# ****************


def menu(food, *args, **kwargs):
    print(food)
    #Tuple
    print(args)
    print('args[0] = ' + args[0])
    print('args[1] = ' + args[1])
    #Dictionary type
    print(kwargs)
    #It is also possible to output Key and Value separately
    for k,v in kwargs.items():
        print('Key is '+k+'. Value is '+v+ '.')


menu('Apple', 'Banana', 'Orange', entree='Beef', drink='Beer')

Since the first argument 'Apple' is received by the food of the function menu

    print(food) #Output: Apple

It will be. Next, there is a * args with one asterisk on the function menu side. It takes multiple arguments as tuples. It is as follows.

    print(args) #output:('Banana', 'Orange')

Tuples can also be treated like arrays It is also possible to pick up the value as follows.

    print('args[0] = ' + args[0])
    #Output: args[0] = Banana
    print('args[1] = ' + args[1])
    #Output: args[1] = Orange

Finally, there is a ** kwargs with two asterisks on the function menu side. It can be received in dictionary form. I'm sending ʻentree ='Beef', drink ='Beer'as argumentsKey"entree"： Value"Beef" Key" drink ": Receives in a dictionary type of the form Value" Beer ". As a result, if you normally output with print ()`

python

print(kwargs) #output:{'entree': 'Beef', 'drink': 'Beer'}

However, get each by for k, v in kwargs.items ():

python

    for k,v in kwargs.items():
        print('Key is '+k+'. Value is '+v+ '.')
    #output
    # Key is entree. Value is Beef.
    # Key is drink. Value is Beer.

You can also.

Summary

There are various ways to pass functions by value, and you can use them conveniently depending on your ingenuity. Python is used in conjunction with various frameworks and libraries I want to keep the basics down.