Python字典获取Key的值
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Python Dictionary get value of Key
提问by Aaron
Is there a way to get the value of the key, not the key valuein a dictionary? for example:
有没有一种方法来获得关键的价值，而不是键值在字典？例如：
d = {"testkey": "testvalue"}
print(d.get("testkey"))
#OUTPUT: "testvalue"
Is there a way to get the String "testkey"? I will have no way of knowing what the String returned will be in the end. Would it be more beneficial to use a list instead of a dictionary?
有没有办法获得字符串“testkey”？我将无法知道返回的字符串最终会是什么。使用列表而不是字典会更有益吗？
回答by Idos
You are looking for the keys()function (used as d.keys()).
You may also use this:
您正在寻找keys()函数（用作d.keys()）。
你也可以使用这个：
for key in d:
print "key: %s , value: %s" % (key, d[key])
for all the information.
对于所有信息。
回答by elegent
First note that dictsare not intended to be used this way. Anyway you can use a simple list comprehension and the items()method, since there could be more than one result:
首先请注意，dicts不打算以这种方式使用。无论如何，您可以使用简单的列表理解和items()方法，因为结果可能不止一个：
[key for key, val in d.items() if val == someValue]
For instance:
例如：
>>> myDict = {1:"egg", "Answer":42, 8:14, "foo":42}
>>> [key for key, val in myDict.items() if val == 42]
['Answer', 'foo']
