消除python中字典中的重复 [英] Eliminating repetition among the dictionary in python

问题描述

我正在python中创建一个字典，但是列表和python之间的细节让我很困惑。我有什么是

I am working on creating a dictionary in python but the thin line between list and python is confusing me alot. What i have is

values = []

我将把这些值存储为

values.append（{newvalue：oldvalue}）

列表或字典不管它是什么，它正在工作，但不检查它们之间的重复。所以我做的是

the list or dictionary whatever it is, it's working but is not checking for repetition among itself. so what i did is

for i in range(len(values)):
    if ((newvalue not in values[i])):
         values.append({newvalue: oldvalue})

但这不行。为什么？我如何解决这个问题？如果你有时间，请说明与字典有什么不同的列表，我在代码中有什么。一个列表或字典？

but this is not working. why? and how can i resolve this? and if you have time please explain how different is list with dictionary and what do i have in my code. a list or a dictionary?

谢谢

推荐答案

，如果你想要一个空的字典，不要做 values = [] ，这将列出一个列表，而不是

first of all, if you want an empty dictionary, dont do values = [] that will make a list, instead do

values = {}

添加到字典时，

mydict[mykey] = myvalue

当检查是否有东西已经在钥匙这样做

when checking to see if something is already in the keys do this

if newkey not in mydict:
    print('this will not overwrite anything')

我觉得你是误会字典的概念

当您这样做键将是您的字典键，而 val 将是您的字典值。字典是{key：value}顺序的组合对，所以如果你执行 myDict [key] ，你将得到 value

I think you are misunderstanding the concept of a dictionary
When you do this key will be your dictionary key, and val will be your dictionary value. A dictionary is a combination of pairs of terms in the order {key: value} so if you do myDict[key] you will get value

如果你想添加到字典，同时确保你没有覆盖任何东西，这个简单的例子将为你做这个。

If you want to add to a dictionary while making sure that you aren't overwriting anything, this simple example will do that for you.

if newkey not in mydict:
    mydict[newkey] = newvalue

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