How Can I Pass A Defined Dictionary To **kwargs In Python?

This is my first time posting here. Hopefully I can get nice advice:) I learned how to pass both **kwargs and *args into a function, and it worked pretty well, like the following:

Solution 1:

There are 4 possible cases:

You call the function using named arguments and you want named variables in the function: (note the default values)

defbuy(orange=2, apple=3):
    print('orange: ', orange)
    print('apple: ', apple)

buy(apple=4)
# orange:  2# apple:  4

You call the function using named arguments but you want a dictionary in the function: then use **dictionaryname in the function definition to collect the passed arguments

defbuy(**shoppinglist):
    for name, qty in shoppinglist.items():
        print('{}: {}'.format(name, qty) )

buy(apple=4, banana=5)
# banana: 5# apple: 4

You call the function passing a dictionary but you want named variables in the function: use **dictionaryname when calling the function to unpack the dictionary

defbuy(icecream=1, apple=3, egg=1):
    print('icecream:', icecream)
    print('apple:', apple)
    print('egg:', egg)

shoppinglist = {'icecream':5, 'apple':1}
buy(**shoppinglist)
# icecream: 5# apple: 1# egg: 1

You call the function passing a dictionary and you want a dictionary in the function: just pass the dictionary

defbuy(shoppinglist):
    for name, qty in shoppinglist.items():
        print('{}: {}'.format(name, qty) )

shoppinglist = {'egg':45, 'apple':1}
buy(shoppinglist)
# egg: 45# apple: 1

Solution 2:

Use ** before fruits argument.

fruits={"apple":10,
       "banana":8,
       "pineapple":50,
       "mango":45
       }

defmarket_prices(name, **fruits):
    print("Hello! Welcome to "+name+" Market!")
    for fruit, price in fruits.items():
        price_list = " {} is NTD {} per piece.".format(fruit,price)
        print (price_list)

market_prices('Wellcome ', **fruits) #Use **before arguments

Solution 3:

You have a typo defining fruits. It should have been like the following

fruits = {"apple":10,
       "banana":8,
       "pineapple":50,
       "mango":45
       }

Solution 4:

thank you guys for the quick and useful comment! here i try a few and it works! while defining function, if you put ** for your argument, then make sure to put it too when calling it! otherwise, put neither! 1.with **

fruits={"apple":10,
       "banana":8,
       "pineapple":50,
       "mango":45
       }

    defmarket_prices(name, **fruits):
        print("Hello! Welcome to "+name+" Market!")
        for fruit, price in fruits.items():
            price_list = " {} is NTD {} per piece.".format(fruit,price)
            print (price_list)

    market_prices('Wellcome ', **fruits)

2.without** fruits={"apple":10, "banana":8, "pineapple":50, "mango":45 }

defmarket_prices(name, fruits):
    print("Hello! Welcome to "+name+" Market!")
    for fruit, price in fruits.items():
        price_list = " {} is NTD {} per piece.".format(fruit,price)
        print (price_list)

market_prices('Wellcome ', fruits)

problem solved:))xoxo