Python集合方法

Python中的Set是无序且可变的唯一元素的集合。 Python提供了各种与 Set 一起使用的函数。在本文中，我们将看到Python提供的用于处理 Set 的所有函数的列表。

添加和删除元素

我们可以在以下函数的帮助下从集合中添加和删除元素 -

• add()：将给定元素添加到集合中
• clear()：从集合中删除所有元素
• 丢弃（）：从集合中删除元素
• pop()：从集合中返回并移除一个随机元素
• remove()：从集合中移除元素

示例：从集合中添加和删除元素。

Python3

# set of letters
s = {'g', 'e', 'k', 's'}
  
# adding 's'
s.add('f')
print('Set after updating:', s)
  
# Discarding element from the set
s.discard('g')
print('\nSet after updating:', s)
  
# Removing element from the set
s.remove('e')
print('\nSet after updating:', s)
  
# Popping elements from the set
print('\nPopped elememt', s.pop())
print('Set after updating:', s)
  
s.clear()
print('\nSet after updating:', s)

输出

Set after updating: {'k', 's', 'g', 'e', 'f'}

Set after updating: {'k', 's', 'e', 'f'}

Set after updating: {'k', 's', 'f'}

Popped elememt k
Set after updating: {'s', 'f'}

Set after updating: set()

Python Set 方法表

Functions Name	Description
add()	Adds a given element to a set
clear()	Removes all elements from the set
copy()	Returns a shallow copy of the set
difference()	Returns a set that is the difference between two sets
difference_update()	Updates the existing caller set with the difference between two sets
discard()	Removes the element from the set
frozenset()	Return an immutable frozenset object
intersection()	Returns a set that has the intersection of all sets
intersection_update()	Updates the existing caller set with the intersection of sets
isdisjoint()	Checks whether the sets are disjoint or not
issubset()	Returns True if all elements of a set A are present in another set B
issuperset()	Returns True if all elements of a set A occupies set B
pop()	Returns and removes a random element from the set
remove()	Removes the element from the set
symmetric_difference()	Returns a set which is the symmetric difference between the two sets
symmetric_difference_update()	Updates the existing caller set with the symmetric difference of sets
union()	Returns a set that has the union of all sets
update()	Adds elements to the set

注意：有关Python集的更多信息，请参阅Python集教程。