临时打包字典 [英] Temporarily unpack dictionary

问题描述

说，我有一个这样的dic

  my_dictionary = {'a'：1，'c' 'b'：20，'d'：7} 
  

现在，我想用我的dic：

  if my_dictionary ['a'] == 1和my_dictionary ['d'] == 7：
打印my_dictionary ['c'] 
  

这看起来很可笑，因为我输入my_dictionary 3次！ p>

所以有什么语法可以让我做这样的事情：

  in my_dictionary：
如果一个== 1和d == 7：
打印c 
  

---

如果在我的dic中没有什么更多的东西（在这种情况下是b），这实际上会起作用：

  def f（a，d，c）：
如果一个== 1和d == 7：
 print c 
 
f（** my_dictionary）
  

解决方案

p>您可以将您的功能更改为

  def f（a，d，c，** args）：
如果一个== 1和d == 7：
 print c 
  

然后即使您在dict中有其他项目，它也会工作。

Say, I have a dic like this

my_dictionary = {'a':1,'c':5,'b':20,'d':7}

Now, I want to do this with my dic:

if my_dictionary['a'] == 1 and my_dictionary['d'] == 7:
    print my_dictionary['c']

This looks ridiculous because I am typing my_dictionary 3 times!

So is there any syntax which would allow me to do something like this:

within my_dictionary:
    if a == 1 and d == 7:
        print c

---

This would actually work if I didn't have anything more (in this case b) in my dic:

def f(a,d,c):
    if a == 1 and d == 7:
        print c 

f(**my_dictionary)

解决方案

You can change your function to

def f(a,d,c,**args):
    if a == 1 and d == 7:
        print c

then it will work even if you have other items in the dict.

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