集合
set
创建空集合 a=set()
转化一个数据为集合:set(obj), 注意数字不能直接转化成集合,其他都可以,只要是可迭代类型
set(一个字典),则集合内元素为字典的键值:
关键是集合内置了去重,交集,并集,差集,对称差集函数,这是别的数据类型没有的
def
difference(
self
,
*
args,
*
*
kwargs):
# real signature unknown
"""
Return the difference of two or more sets as a new set. A中存在,B中不存在
(i.e. all elements that are in this set but not the others.)
"""
pass
def
difference_update(
self
,
*
args,
*
*
kwargs):
# real signature unknown
""" 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"""
pass
def
discard(
self
,
*
args,
*
*
kwargs):
# real signature unknown
"""
Remove an element from a set if it is a member.
If the element is not a member, do nothing. 移除指定元素,不存在不保错
"""
pass
def
intersection(
self
,
*
args,
*
*
kwargs):
# real signature unknown
"""
Return the intersection of two sets as a new set. 交集
(i.e. all elements that are in both sets.)
"""
pass
def
intersection_update(
self
,
*
args,
*
*
kwargs):
# real signature unknown
""" Update a set with the intersection of itself and another. 取交集并更更新到A中 """
pass
def
pop(
self
,
*
args,
*
*
kwargs):
# real signature unknown
"""
Remove and return an arbitrary set element.
Raises KeyError if the set is empty. 移除元素
"""
pass
def
remove(
self
,
*
args,
*
*
kwargs):
# real signature unknown
"""
Remove an element from a set; it must be a member.
If the element is not a member, raise a KeyError. 移除指定元素,不存在保错
"""
pass
def
symmetric_difference(
self
,
*
args,
*
*
kwargs):
# real signature unknown
"""
Return the symmetric difference of two sets as a new set. 对称差集,所有差集,A中有B中没有+B中有A中没
i.e. all elements that are in exactly one of the sets.)
"""
pass
def
symmetric_difference_update(
self
,
*
args,
*
*
kwargs):
# real signature unknown
""" Update a set with the symmetric difference of itself and another. 对称差集,并更新到a中 """
pass
def
union(
self
,
*
args,
*
*
kwargs):
# real signature unknown
"""
Return the union of sets as a new set. 并集
(i.e. all elements that are in either set.)
"""
pass
def
update(
self
,
*
args,
*
*
kwargs):
# real signature unknown
""" Update a set with the union of itself and others. 更新 """
pass
实例: