python中创建集合

1、直接创建

>>> a = {111,"aaa",222,"bbb",555}
>>> a
{555, 111, 'aaa', 'bbb', 222}
>>> type(a)
<class 'set'>

2、字符串转换

>>> a = "helloworld"
>>> a
'helloworld'
>>> type(a)
<class 'str'>
>>> b = set(a)
>>> b
{'w', 'l', 'h', 'e', 'o', 'r', 'd'}
>>> type(b)
<class 'set'>

3、

>>> a = ["aaa","bbb","ccc","ddd"]
>>> a
['aaa', 'bbb', 'ccc', 'ddd']
>>> type(a)
<class 'list'>
>>> b = set(a)
>>> b
{'bbb', 'ccc', 'aaa', 'ddd'}
>>> type(b)
<class 'set'>

4、元组转换

>>> a = (111,222,333,444)
>>> a
(111, 222, 333, 444)
>>> type(a)
<class 'tuple'>
>>> b = set(a)
>>> b
{444, 333, 222, 111}
>>> type(b)
<class 'set'>

5、字典转换

>>> a = {"a":111,"b":222,"c":333}
>>> a
{'a': 111, 'b': 222, 'c': 333}
>>> type(a)
<class 'dict'>
>>> b = set(a)
>>> b
{'c', 'a', 'b'}
>>> type(b)
<class 'set'>