class set(object): """ >>> li=set(['aaa','bbb','aaa']) >>> li {'aaa', 'bbb'} >>> st=set('aabccddf') >>> st {'a', 'b', 'd', 'c', 'f'} """ def add(self, *args, **kwargs): #添加,把传入的元素作为一个整个添加进去 >>> st.add('python') >>> st {'d', 'f', 'python', 'a', 'b', 'c'} def update(self, *args, **kwargs): # 更新,把传入的元素拆分然后传入集合 """ >>> s1=set('boy') >>> s1 {'b', 'y', 'o'} >>> s1.update('python') >>> s1 {'t', 'y', 'p', 'n', 'h', 'b', 'o'} """ pass def clear(self, *args, **kwargs): # 清空 >>> st.clear() >>> st set() pass def copy(self, *args, **kwargs): # 拷贝 def difference(self, *args, **kwargs): #差集。在s1集合,不在s2集合的,操作后可以输出返回值 >>> s1=set(['aaa','bbb']) >>> s2=set(['bbb','ccc']) >>> s1.difference(s2) {'aaa'} def difference_update(self, *args, **kwargs): #将s1更新为s1-s2的差集。没有返回值 >>> s1 {'aaa', 'bbb'} >>> s2 {'bbb', 'ccc'} >>> s1.difference_update(s2) >>> s1 {'aaa'} >>> s2 {'bbb', 'ccc'} def discard(self, *args, **kwargs): # 删除 def remove(self, *args, **kwargs): # 删除 #set.remove(obj)和set.discard(obj)的区别在于,当obj存在于set中时,都将其删除;但当obj不存在于set中时,remove()会报错,discard()不会。 def intersection(self, *args, **kwargs): # 交集 s1 & s2 >>> s1=set(['aaa','bbb']) >>> s2=set(['bbb','ccc']) >>> d=s1.intersection(s2) >>> print(d) {'bbb'} def intersection_update(self, *args, **kwargs): # 交集 s1更新为这个值 def isdisjoint(self, *args, **kwargs): # 没有交集 >>> s1.isdisjoint(s2) False def issubset(self, *args, **kwargs): # s1的每一个元素都在s2中 >>> s1=set('abc') >>> s2=set('abcdef') >>> s1.issubset(s2) True def issuperset(self, *args, **kwargs): # s2的每一个元素都在s1中 >>> s1.issuperset(s2) False def pop(self, *args, **kwargs): # 删除 """ Remove and return an arbitrary set element. Raises KeyError if the set is empty. """ pass def symmetric_difference(self, *args, **kwargs): # s1,s2的对称差,有返回值 >>> s1=set(['aaa','bbb']) >>> s2=set(['bbb','ccc']) >>> d=s1.symmetric_difference(s2) >>> print(d) {'ccc', 'aaa'} def symmetric_difference_update(self, *args, **kwargs): # s1更新为s1,s2的对称差,没有返回值 >>> s1=set(['aaa','bbb']) >>> s2=set(['bbb','ccc']) >>> s1.symmetric_difference_update(s2) >>> s1 {'aaa', 'ccc'} def union(self, *args, **kwargs): # 并集 s1 | s2
集合 (set)
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转载自www.cnblogs.com/xiaobaozi-95/p/8931890.html
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