python3_set方法

>>> s={'s','s','t'}
>>> s
{'s', 't'}
>>> type(s)
<class 'set'>
>>>
>>> s=set([1,2,3,4,5,6,7])
>>> s
{1,

>>> dir(set())
['__and__', '__class__', '__contains__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__iand__', '__init__', '__init_subclass__', '__ior__', '__isub__', '__iter__', '__ixor__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__or__', '__rand__', '__reduce__', '__reduce_ex__', '__repr__', '__ror__', '__rsub__', '__rxor__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', '__xor__', 'add', 'clear', 'copy', 'difference', 'difference_update', 'discard', 'intersection', 'intersection_update', 'isdisjoint', 'issubset', 'issuperset', 'pop', 'remove', 'symmetric_difference', 'symmetric_difference_update', 'union', 'update']
>>>

'add'添加, 'clear'清空, 'copy'复制, 'difference'差异（清除）, 'difference_update'清除更新, 'discard'移除, 'intersection'交集, 'intersection_update'交集更新, 'isdisjoint'无交集, 'issubset'子集, 'issuperset'父集, 'pop'移除, 'remove'移除, 'symmetric_difference'差集, 'symmetric_diffeence_update'减, 'union'并集, 'update'更新



add(self, *args, **kwargs): 
>>> s=set()
>>> s.add('gg')
>>> s
{'gg'}
>>>

clear(self, *args, **kwargs): 
>>> s={'a','g'}
>>> s
{'g', 'a'}
>>> s.clear()
>>> s
set()
>>>


copy(self, *args, **kwargs): 
>>> s={'s'}
>>> s1=s.copy()
>>> s1
{'s'}
>>>

difference(self, *args, **kwargs): 
>>> s0={"a",'b','c'}
>>> s1={'b','c','d'}
>>> s0
{'c', 'a', 'b'}
>>> s1
{'c', 'd', 'b'}
>>> s0.difference(s1)
{'a'}
>>>

difference_update(self, *args, **kwargs): 
>>> s0={"a",'b','c'}
>>> s1={'b','c','d'}
>>> s0.difference_update(s1)
>>> s0
{'a'}

discard(self, *args, **kwargs): 
>>> s=set('agsgasf')
>>> s
{'s', 'g', 'a', 'f'}
>>> s.discard('s')
>>> s
{'g', 'a', 'f'}
>>>

intersection(self, *args, **kwargs): 
>>> s
{'g', 'a', 'f'}
>>> s.intersection(set('afh'))
{'a', 'f'}
>>>

intersection_update(self, *args, **kwargs): 
>>> s
{'g', 'a', 'f'}

>>> s.intersection_update(set('afh'))
>>> s
{'a', 'f'}
>>>

isdisjoint(self, *args, **kwargs): 
>>> s
{'a', 'd', 's', 'f'}
>>> s.isdisjoint('c')
True
>>>

issubset(self, *args, **kwargs): 
>>> s
{'a', 'd', 's', 'f'}
>>> s.issubset('adsfg')
True
>>>

issuperset(self, *args, **kwargs): 
>>> s
{'a', 'd', 's', 'f'}
>>> s.issuperset('a')
True
>>>

pop(self, *args, **kwargs): 
>>> s
{'a', 'd', 's', 'f'}
>>> s.pop()
'a'
>>> s
{'d', 's', 'f'}
>>>

remove(self, *args, **kwargs): 
>>> s
{'d', 's', 'f'}
>>> s.remove('s')
>>> s
{'d', 'f'}
>>>

symmetric_difference(self, *args, **kwargs): 
>>> s
{'a', 's', 'f'}
>>> s.symmetric_difference('s')
{'a', 'f'}
>>>

symmetric_difference_update(self, *args, **kwargs): 
>>> s
{'s', 'f'}
>>> s.symmetric_difference_update('s')
>>> s
{'f'}
>>>

union(self, *args, **kwargs): 
>>> s
{'f'}
>>> s.union('sfsghj')
{'h', 's', 'f', 'j', 'g'}
>>>


update(self, *args, **kwargs):
>>> s=set('abc')
>>> s.update('bd')
>>> s
{'a', 'd', 'b', 'c'}
>>>