词典列表中的词典集 [英] set of dictionaries in list of dictionarys

问题描述

试图在列表中找到一组字典。

trying to find a set of dictionaries in a list.

说我有以下字典列表：

rm_dict = [{'name':'rick','subject':'adventure time mortttty buugh','body':['wubba lubba dub dubbb motha f*&^%!', 'morty get over here!']},
 {'name':'rick','subject':'adventure time mortttty buugh','body':['wubba lubba dub dubbb motha f*&^%!', 'morty get over here!']},
 {'name':'morty','subject':'re:adventure time mortttty buugh','body':['youre drunk rick!', 'I'm going to get mom', 'you always do this']}]

尝试只设置 ，我得到一个错误。

trying just set, I get an error.

set(rm_dict)

我接受邮件/电子邮件的正文，因为这就是我要的内容使用定义为唯一，并创建所有电子邮件正文的列表，然后为 set（tuple（））等做一个生成器。 / p>

I take the body of the message/email, because that's what I'll use to define as unique, and create a list of the body of all of the emails, and then I will do a generator for set(tuple()) etc..

list_of_body = [x['body'] for x in rm_dict]
>>[['wubba lubba dub dubbb motha f*&^%!'],
  ['wubba lubba dub dubbb motha f*&^%!'],
  ['youre drunk rick!']]

[list(item) for item in set(tuple(row) for row in list_of_body)]
>>[['wubba lubba dub dubbb motha f*&^%!'], ['youre drunk rick!']]

这成功地使我从 list_of_body 中获得了唯一的正文，但是我希望从原始列表中获得 whole 词典。

This succeeds in getting me the unique bodies from the list_of_body, but I want the whole dictionary from the original list.

推荐答案

您的错误消息告诉您一些重要信息：字典或列表都不是可哈希的，因此不能用作set的成员。解决该问题的一种方法是使用 str ，它是数据中电子邮件正文的第0个元素。

Your error message is telling you something important: neither a dictionary or a list is hashable, and so cannot be used as a member of set. One way to work around that is to use the str that is the 0th element of the email body in your data.

您可以使用列表理解功能根据其键之一唯一化您的列表：

You can "uniqify" your list based on one of its keys with a list comprehension:

>>> seen = set()
>>> [i for i in rm_dict if i['body'][0] not in seen and not seen.add(i['body'][0])]
[{'name': 'rick',
  'subject': 'adventure time mortttty buugh',
  'body': ['wubba lubba dub dubbb motha f*&^%!']},
 {'name': 'morty',
  'subject': 're:adventure time mortttty buugh',
  'body': ['youre drunk rick!']}]

这里是另一种形式，没有理解：

Here's another form, without the comprehension:

>>> seen = set()
>>> emails = []
>>> for i in rm_dict:
...     body = i['body'][0]
...     if body not in seen:
...         emails.append(i)
...         seen.add(body)
...         

>>> emails
[{'name': 'rick',
  'subject': 'adventure time mortttty buugh',
  'body': ['wubba lubba dub dubbb motha f*&^%!']},
 {'name': 'morty',
  'subject': 're:adventure time mortttty buugh',
  'body': ['youre drunk rick!']}]

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