快捷導(dǎo)航

淺談Python的字典鍵名可以是哪些類型

更新時(shí)間：2021年09月02日 10:41:20 作者：張欣-男

本文主要介紹了Python的字典鍵名可以是哪些類型，文中通過(guò)示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

1 鍵的類型，列表/字典不可以，其它都可以

但是網(wǎng)上卻沒(méi)有說(shuō)其他類型可不可以，怎么用的。我寫代碼試了下：

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)

輸出結(jié)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 多個(gè)對(duì)象可當(dāng)作鍵名，順序不同時(shí)是不同的鍵

print(d[p, q])
print(d[q, p])

輸出：

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>)