python中向集合中增加元素和删除元素

 

1、集合单个增加元素

>>> a = {111,222,333,444}
>>> a
{444, 333, 222, 111}
>>> type(a)
<class 'set'>
>>> a.add(555)
>>> a
{555, 333, 111, 444, 222}
>>> a.add("aaa")
>>> a
{555, 333, 111, 'aaa', 444, 222}

 

2、集合批量增加元素

>>> a = {111,222,333}
>>> a
{333, 222, 111}
>>> type(a)
<class 'set'>
>>> b = ["aaa","bbb","ccc"]
>>> b
['aaa', 'bbb', 'ccc']
>>> type(b)
<class 'list'>
>>> for i in b:
    a.add(i)

    
>>> a
{'ccc', 333, 111, 'bbb', 222, 'aaa'}

 

3、单个删除元素

>>> a = {"aaa","bbb","ccc"}
>>> a
{'aaa', 'ccc', 'bbb'}
>>> type(a)
<class 'set'>
>>> a.remove("aaa")
>>> a
{'ccc', 'bbb'}
>>> a.remove("ccc")
>>> a
{'bbb'}

 

4、批量删除元素

>>> a = {"aaa","bbb","ccc","ddd","eee","fff","ggg","hhh","iii"}
>>> a
{'ccc', 'ggg', 'hhh', 'bbb', 'fff', 'eee', 'iii', 'ddd', 'aaa'}
>>> type(a)
<class 'set'>
>>> b = ("aaa","bbb","ccc","ddd")
>>> b
('aaa', 'bbb', 'ccc', 'ddd')
>>> type(b)
<class 'tuple'>
>>> for i in b:
    a.remove(i)

    
>>> a
{'ggg', 'hhh', 'fff', 'eee', 'iii'}