在Python中设置 add()

如果元素不存在于集合中，则 set add() 方法将给定元素添加到集合中。

句法：

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.
Parameters:
add() takes single parameter(elem) which needs to 
be added in the set.
Returns:
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')}