How to test if a dictionary contains a specific key?

2018-06-09 15:31:16

Possible Duplicate:
What is a good way to test if a Key exists in Python Dictionary

What's the cleanest way to test if a dictionary contains a key?

x = {'a' : 1, 'b' : 2}
if (x.contains_key('a')):
    ....

'a' in x

并快速搜索揭示了一些关于它的好信息：http://docs.python.org/3/tutorial/datastructures.html#dictionaries

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