[英]How can I pass a defined dictionary to **kwargs in Python?
This is my first time posting here.这是我第一次在这里发帖。 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:希望我能得到好的建议:) 我学会了如何将
**kwargs
和*args
传递给一个函数,它运行得很好,如下所示:
def market_prices(name, **kwargs):
print("Hello! Welcome to "+name+" Market!")
for fruit, price in kwargs.items():
price_list = " {} is NTD {} per piece.".format(fruit,price)
print (price_list)
market_prices('Wellcome',banana=8, apple=10)
However in real case, I'd rather pre-defined a dictionary with lots of key&value, so I won't don't have to type in every parameter when calling my function.但是在实际情况下,我宁愿预先定义一个包含大量键和值的字典,这样在调用我的函数时就不必输入每个参数。 I have searched online but cannot find a good example or explanation:/ Could you give me some advice?
我在网上搜索过,但找不到好的例子或解释:/你能给我一些建议吗? Here is the code I try to utilize:
这是我尝试使用的代码:
fruits:{"apple":10,
"banana":8,
"pineapple":50,
"mango":45
}
def market_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)
NameError: name 'fruits' is not defined NameError:未定义名称“水果”
Thank you so much!:)非常感谢!:)
There are 4 possible cases:有4种可能的情况:
You call the function using named arguments and you want named variables in the function:您使用命名参数调用函数,并且希望在函数中使用命名变量:
(note the default values) (注意默认值)
def buy(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:您使用命名参数调用该函数,但您希望函数中有一个字典:
then use **dictionaryname
in the function definition to collect the passed arguments然后在函数定义中使用
**dictionaryname
来收集传递的参数
def buy(**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:您调用传递字典的函数,但您希望在函数中使用命名变量:
use **dictionaryname
when calling the function to unpack the dictionary调用函数解压
**dictionaryname
时使用**dictionaryname
dictionaryname
def buy(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:您调用传递字典的函数,并且您希望函数中有一个字典:
just pass the dictionary只是通过字典
def buy(shoppinglist):
for name, qty in shoppinglist.items():
print('{}: {}'.format(name, qty) )
shoppinglist = {'egg':45, 'apple':1}
buy(shoppinglist)
# egg: 45
# apple: 1
Use **
before fruits argument.在水果参数之前使用
**
。
fruits={"apple":10,
"banana":8,
"pineapple":50,
"mango":45
}
def market_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
You have a typo defining fruits
.你有一个定义
fruits
的错字。 It should have been like the following它应该是这样的
fruits = {"apple":10,
"banana":8,
"pineapple":50,
"mango":45
}
thank you guys for the quick and useful comment!谢谢你们的快速和有用的评论! here i try a few and it works!
在这里,我尝试了一些,并且有效! while defining function, if you put ** for your argument, then make sure to put it too when calling it!
在定义函数时,如果你把 ** 作为你的参数,那么在调用它时一定要加上它! otherwise, put neither!
否则,都不放! 1.with **
1.带**
fruits={"apple":10,
"banana":8,
"pineapple":50,
"mango":45
}
def market_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 } 2.没有**水果={“苹果”:10,“香蕉”:8,“菠萝”:50,“芒果”:45}
def market_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问题解决了:))xoxo
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