014-python基础-set集合

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            class set(object):

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            """
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                set() -> new empty set object

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                set(iterable) -> new set object

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                Build an unordered collection of unique elements.

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            """
              8     def add(self, *args, **kwargs): # real signature unknown  9""" 10        Add an element to a set.     #添加元素
 11 12        This has no effect if the element is already present.
 13""" 14        pass
 15 16     def clear(self, *args, **kwargs): # real signature unknown 17""" Remove all elements from this set. """     #清除所有元素 18        pass
 19 20     def copy(self, *args, **kwargs): # real signature unknown 21""" Return a shallow copy of a set. """            #浅拷贝 22        pass
 23 24     def difference(self, *args, **kwargs): # real signature unknown 25""" 26        Return the difference of two or more sets as a new set.    #a中存在，b中不存在
 27 28        (i.e. all elements that are in this set but not the others.)
 29""" 30        pass
 31 32     def difference_update(self, *args, **kwargs): # real signature unknown 33""" Remove all elements of another set from this set. 从当前集合中删除和B中相同的元素""" 34        pass
 35 36     def discard(self, *args, **kwargs): # real signature unknown 37""" 38        Remove an element from a set if it is a member.    移除指定元素，不存在不报错
 39 40        If the element is not a member, do nothing.
 41""" 42        pass
 43 44     def intersection(self, *args, **kwargs): # real signature unknown 45""" 46        Return the intersection of two sets as a new set.   交集
 47 48        (i.e. all elements that are in both sets.)
 49""" 50        pass
 51 52     def intersection_update(self, *args, **kwargs): # real signature unknown 53""" Update a set with the intersection of itself and another.   取交集并更新到a中 """ 54        pass
 55 56     def isdisjoint(self, *args, **kwargs): # real signature unknown 57""" Return True if two sets have a null intersection. 如果没有交集，返回True """ 58        pass
 59 60     def issubset(self, *args, **kwargs): # real signature unknown 61""" Report whether another set contains this set. 是否是子序列  """ 62        pass
 63 64     def issuperset(self, *args, **kwargs): # real signature unknown 65""" Report whether this set contains another set.   是否是父序列""" 66        pass
 67 68     def pop(self, *args, **kwargs): # real signature unknown 69""" 70        Remove and return an arbitrary set element.  移除元素
 71        Raises KeyError if the set is empty.
 72""" 73        pass
 74 75     def remove(self, *args, **kwargs): # real signature unknown 76""" 77        Remove an element from a set; it must be a member.   移除指定元素，不存在保错
 78 79        If the element is not a member, raise a KeyError.
 80""" 81        pass
 82 83     def symmetric_difference(self, *args, **kwargs): # real signature unknown 84""" 85        Return the symmetric difference of two sets as a new set.   对称差集，a有b没有 + b有a没有  
 86 87        (i.e. all elements that are in exactly one of the sets.)
 88""" 89        pass
 90 91     def symmetric_difference_update(self, *args, **kwargs): # real signature unknown 92""" Update a set with the symmetric difference of itself and another. """   对称差集，并更新到a中 93        pass
 94 95     def union(self, *args, **kwargs): # real signature unknown 96""" 97        Return the union of sets as a new set.             并集
 98 99        (i.e. all elements that are in either set.)
100"""101        pass
102103     def update(self, *args, **kwargs): # real signature unknown104""" Update a set with the union of itself and others.   更新，一般把一个list通过迭代方式更新到set集群中"""105         pass