我如何从python字典中获得特定的元素和键

Question

我是python的新手，我在python字典上遇到了麻烦这是我的代码:

dic = {"days":["mon","tue","wed"]}
print(dic[0])

我期望的输出是

"mon","tue","wed"

但是我一直得到这个错误:

print(dic[0])
KeyError: 0

请帮帮我…谢谢你！

Answer 1

尝试:

print(dic['days']) 

通过键来引用值。它返回一个元素列表。然后，如果你想要一个特定的元素，只需使用:

print(dic['days'][0])

…就像你处理一个普通的列表一样。

Answer 2

python中的字典是通过key而不是index来访问的，因为直到3.7版本才保证字典的位置。

dic = {"days":["mon","tue","wed"]}
print(dic["days"])

Answer 3

谢谢大家，我找到答案了

dic = {"days":["mon","tue","wed"], "months":["jan","feb","mar"]}
print(list(dic.values())[0])

的输出将是:

['mon', 'tue', 'wed']