浅谈Python的字典键名可以是哪些类型_Python

浅谈Python的字典键名可以是哪些类型

2021-12-29 00:18张欣-男 Python

本文主要介绍了Python的字典键名可以是哪些类型，文中通过示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

1 键的类型，列表/字典不可以，其它都可以

但是网上却没有说其他类型可不可以，怎么用的。我写代码试了下：

				?

									class Person:

									    def __init__(self, name):

									        self.name = name

									i = 5

									s = 'abc'

									t = (5,'a')

									p = Person('Lily')

									q = Person('xiao')

									m = {'a':1, 'b':10}

									lst = [1,2,3]

									d = {}

									d[i] = 'five'

									d[s] = 'ABC'

									d[t] = 'five-a'

									d[p] = 'name:Lily'

									# d[lst] = 'list : 1,2,3'

									# TypeError: unhashable type: 'list'

									d[p, q] = 'two people: Lily and xiao'

									d[i,s,t,p,q] = 'all in key'

									for k, v in d.items():

									    print(k, '=>', v)

输出结果：

5 => five
abc => ABC
(5, 'a') => five-a
<__main__.Person object at 0x000001803EEF27F0> => name:Lily
(<__main__.Person object at 0x000001803EEF27F0>, <__main__.Person object at 0x000001803EEF28D0>) => two people: Lily and xiao
(5, 'abc', (5, 'a'), <__main__.Person object at 0x000001803EEF27F0>, <__main__.Person object at 0x000001803EEF28D0>) => all in key

2 多个对象可当作键名，顺序不同时是不同的键

				?

									print(d[p, q])

									print(d[q, p])

输出：

two people: Lily and xiao
Traceback (most recent call last):

File "<ipython-input-15-12aff481ab93>", line 1, in <module>
    runfile('C:/Users/Xpeng/.spyder-py3/temp.py', wdir='C:/Users/Xpeng/.spyder-py3')

File "D:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\spyder\utils\site\sitecustomize.py", line 705, in runfile
    execfile(filename, namespace)

File "D:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

File "C:/Users/Xpeng/.spyder-py3/temp.py", line 37, in <module>
    print(d[q, p])

KeyError: (<__main__.Person object at 0x000001803EF58940>, <__main__.Person object at 0x000001803EF58668>)