ajax+post跨越请求怎么解决
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检查一个元素是在dicitonary或set是否存在 这在Python中非常快的。这是因为dict和set使用哈希表来实现。查找效率可以达到O(1)。因此,如果您需要经常检查成员,使用 set 或 dict做为你的容器.
>>> mylist = ['a', 'b', 'c'] #Slower, check membership with list:
>>> ‘c’ in mylist
>>> True
>>> myset = set(['a', 'b', 'c']) # Faster, check membership with set:
>>> ‘c’ in myset:
>>> True
>>> mylist = ['a', 'b', 'c'] #Slower, check membership with list:
>>> ‘c’ in mylist
>>> True
>>> myset = set(['a', 'b', 'c']) # Faster, check membership with set:
>>> ‘c’ in myset:
>>> True
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