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官网链接 filter(function, iterable)¶ Construct an iterator from those elements of iterable for which function returns true. iterable may be either a seque 阅读全文
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str:' ';" " class str(basestring): """ str(object='') string Return a nice string representation of the object. If the argument is a string, the retur 阅读全文
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class int(object): """ int(x=0) int or long int(x, base=10) int or long Convert a number or string to an integer, or return 0 if no arguments are give 阅读全文
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set集合，是一个无序且不重复的元素集合 A = set([1, 2, 3, 4, 5, 6,]) B = set([2, 3, 4, 5, 6, 7, 8]) type(A) type(B) class set(object): """ set() new empty set object set 阅读全文