在 Python 字典中查找和替换值 [英] Finding and replacing a value in a Python dictionary

问题描述

我是 stackoverflow 的完全新手，所以如果我最终将其发布在错误的地方(或任何其他与新手相关的 mitakes！谢谢！)，请原谅我.

I'm a complete newbie to stackoverflow, so please excuse me if I end up posting this in the wrong place (or any other newbie-related mitakes! Thanks!).

我的问题与 Python 3.x 有关，我试图在其中基本上访问一个非常小的字典中的一个值(3 个键，每个 1 个值).我在网上(和这里)搜索了高和低，但似乎找不到与替换字典中的值有关的任何内容.我找到了替换"功能，但似乎不适用于字典.

My question pertains to Python 3.x, where I am trying to basically access a value in a very small dictionary (3 keys, 1 value each). I have searched high and low on the web (and on here), but cannot seem to find anything pertaining to replacing a value in a dictionary. I have found the "replace" function, but does not seem to work for dictionaries.

所以，这是我的字典:

a1 = {"Green": "Tree", "Red": "Rose", "Yellow": "Sunflower"}

例如，我将如何查询值Rose"以将其替换为Tulip"?

How would I go about querying the value "Rose" to replace it with "Tulip," for example?

任何帮助都将不胜感激，即使只是为我指明正确的方向！

Any help would be greatly appreciated, even if it is just to point me in the right direction!

非常感谢！

推荐答案

首先必须找到值为 "Rose" 的键:

You first must find the key that has the value "Rose":

for color, flower in a1.items():
    if flower == "Rose":
        a1[color] = "Tulip"

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