前言
该文章描述了函数set()的使用
2020-01-17
天象独行
0X01；查看set()使用方法
Help on class set in module builtins: class set(object) | set() -> new empty set object | set(iterable) -> new set object | | Build an unordered collection of unique elements. | | Methods defined here: | | __and__(self, value, /) | Return self&value. | | __contains__(...) | x.__contains__(y) <==> y in x. | | __eq__(self, value, /) | Return self==value. | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __gt__(self, value, /) | Return self>value. | | __iand__(self, value, /) | Return self&=value. | | __init__(self, /, *args, **kwargs) | Initialize self. See help(type(self)) for accurate signature. | | __ior__(self, value, /) | Return self|=value. | | __isub__(self, value, /) | Return self-=value. | | __iter__(self, /) | Implement iter(self). | | __ixor__(self, value, /) | Return self^=value. | | __le__(self, value, /) | Return self<=value. | | __len__(self, /) | Return len(self). | | __lt__(self, value, /) | Return self<value. | | __ne__(self, value, /) | Return self!=value. | | __or__(self, value, /) | Return self|value. | | __rand__(self, value, /) | Return value&self. | | __reduce__(...) | Return state information for pickling. | | __repr__(self, /) | Return repr(self). | | __ror__(self, value, /) | Return value|self. | | __rsub__(self, value, /) | Return value-self. | | __rxor__(self, value, /) | Return value^self. | | __sizeof__(...) | S.__sizeof__() -> size of S in memory, in bytes | | __sub__(self, value, /) | Return self-value. | | __xor__(self, value, /) | Return self^value. | | add(...) | Add an element to a set. | | This has no effect if the element is already present. | | clear(...) | Remove all elements from this set. | | copy(...) | Return a shallow copy of a set. | | difference(...) | Return the difference of two or more sets as a new set. | | (i.e. all elements that are in this set but not the others.) | | difference_update(...) | Remove all elements of another set from this set. | | discard(...) | Remove an element from a set if it is a member. | | If the element is not a member, do nothing. | | intersection(...) | Return the intersection of two sets as a new set. | | (i.e. all elements that are in both sets.) | | intersection_update(...) | Update a set with the intersection of itself and another. | | isdisjoint(...) | Return True if two sets have a null intersection. | | issubset(...) | Report whether another set contains this set. | | issuperset(...) | Report whether this set contains another set. | | pop(...) | Remove and return an arbitrary set element. | Raises KeyError if the set is empty. | | remove(...) | Remove an element from a set; it must be a member. | | If the element is not a member, raise a KeyError. | | symmetric_difference(...) | Return the symmetric difference of two sets as a new set. | | (i.e. all elements that are in exactly one of the sets.) | | symmetric_difference_update(...) | Update a set with the symmetric difference of itself and another. | | union(...) | Return the union of sets as a new set. | | (i.e. all elements that are in either set.) | | update(...) | Update a set with the union of itself and others. | | ---------------------------------------------------------------------- | Static methods defined here: | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | ---------------------------------------------------------------------- | Data and other attributes defined here: | | __hash__ = None
0X02；描述
set() 函数创建一个无序不重复元素集，可进行关系测试，删除重复数据，还可以计算交集、差集、并集等。
0X03；语法
class set([iterable])
参数：iterable -- 可迭代对象对象；
0X04；返回值
返回新的集合对象。
0X05；举例
>>> x = set('aaron') >>> x {'n', 'o', 'a', 'r'} #集合无重复元素 >>>