dict字典和set集合

dict

Python內置了字典：dict的支持，dict全稱dictionary，在其餘語言中也稱爲map，使用鍵-值（key-value）存儲，具備極快的查找速度。

 

集合特徵：無序且不重複

建立集合

1.set = {1, 2, 3, 4}

2.set2 = set()

3.set3 = set([1, 2, 3, 4])

 

class set(object):

     """

     set() -> new empty set object

     set(iterable) -> new set object

     

     Build an unordered collection of unique elements.

     """

     def  add( self ,  * args,  * * kwargs):  # real signature unknown

         """

         Add an element to a set，添加元素

         

         This has no effect if the element is already present.

         """

         pass

 

     def  clear( self ,  * args,  * * kwargs):  # real signature unknown

         """ Remove all elements from this set. 清除內容"""

         pass

 

     def  copy( self ,  * args,  * * kwargs):  # real signature unknown

         """ Return a shallow copy of a set. 淺拷貝  """

         pass

 

     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.  從當前集合中刪除和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，不存在不保錯

         """

         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.  取交集並更更新到A中 """

         pass

 

     def  isdisjoint( self ,  * args,  * * kwargs):  # real signature unknown

         """ Return True if two sets have a null intersection.  若是沒有交集，返回True，不然返回False"""

         pass

 

     def  issubset( self ,  * args,  * * kwargs):  # real signature unknown

         """ Report whether another set contains this set.  是不是子序列"""

         pass

 

     def  issuperset( self ,  * args,  * * kwargs):  # real signature unknown

         """ Report whether this set contains another set. 是不是父序列"""

         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，不存在保錯

         """

         pass

 

     def  symmetric_difference( self ,  * args,  * * kwargs):  # real signature unknown

         """

         Return the symmetric difference of two sets as a new set.  對稱差集

         

         (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. 對稱差集，並更新到a中 """

         pass

 

     def  union( self ,  * args,  * * kwargs):  # real signature unknown

         """

         Return the union of sets as a new set.  並集

         

         (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