Python 字典 - 是否可以在值中引用键？

Question

我想定义字典如下：

dict = {
    Player: $key.Name + " takes some action"
}

是否有语法可以让我做到这一点？

Answer 1

字典理解可能有帮助。

>> players = ["Mark", "Jack", "John"]
>> player_dict = {k: k + " takes some action" for k in players}
>> player_dict
{'John': 'John takes some action', 'Jack': 'Jack takes some action', 'Mark': 'Mark takes some action'}

它们的形式为

{

键

:

值

for

变量

in

生成器

}

Answer 2

class Player(object): 
    def __init__(self, name):
        self.name = name

p1 = Player("bernard")
p2 = Player("hoagie")

t = (p1, p2, ...)
d = {p: p.name + " something something" for p in t}

Answer 3

听起来您想在分配给该键的值中使用您正在创建的键。是的，这是可能的：

playerDict = {Player: Player + " takes some action"}

Answer 4

对我来说，这个问题的含义与代码所暗示的不同，即：您希望在创建字典的相同上下文中在其值中引用字典键。

您可以使用海象 (:=) 运算符（来自 Python 3.8）来做到这一点：

d = {
    (_ := "key"): f"Value + {_}"
}
print(d)
{'key': 'Value + key'}