Python set add()用法及代码示例

如果集合中不存在给定元素，则该集合add()方法会将其添加到集合中。

用法:

set.add(elem)
The add() method doesn't add an element to the
set if it's already present in it otherwise it 
will get added to the set.
参数：
add() takes single parameter(elem) which needs to 
be added in the set.
返回：
The add() method doesn't return any value.

# set of letters 
GEEK = {'g', 'e', 'k'} 
  
# adding 's' 
GEEK.add('s') 
print('Letters are:', GEEK) 
  
# adding 's' again 
GEEK.add('s') 
print('Letters are:', GEEK)

输出：

('Letters are:', set(['k', 'e', 's', 'g']))
('Letters are:', set(['k', 'e', 's', 'g'])

应用：

It is used to add a new element to the set. 

# set of letters 
GEEK = {6, 0, 4} 
  
# adding 1 
GEEK.add(1) 
print('Letters are:', GEEK) 
  
# adding 0  
GEEK.add(0) 
print('Letters are:', GEEK)

输出：

('Letters are:', set([0, 1, 4, 6]))
('Letters are:', set([0, 1, 4, 6]))

将元组添加到集合中：

# Python code to demonstrate addition of tuple to a set. 
s = {'g', 'e', 'e', 'k', 's'} 
t = ('f', 'o') 
  
# adding tuple t to set s. 
s.add(t) 
  
print(s)

输出：

{'k', 's', 'e', 'g', ('f', 'o')}