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      1. Python Dict 理解创建和更新字典

        Python Dict Comprehension to Create and Update Dictionary(Python Dict 理解创建和更新字典)
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                  本文介绍了Python Dict 理解创建和更新字典的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我有一个字典(数据)列表,并希望将其转换为字典 (x),如下所示.我正在使用以下'for循环'来实现.

                  I have a list of dictionaries (data) and want to convert it into dictionary (x) as below. I am using following ‘for loop’ to achieve.

                  data = [{'Dept': '0123', 'Name': 'Tom'},
                          {'Dept': '0123', 'Name': 'Cheryl'},
                          {'Dept': '0123', 'Name': 'Raj'},
                          {'Dept': '0999', 'Name': 'Tina'}]
                  x = {}
                  
                  for i in data:
                      if i['Dept'] in x:
                          x[i['Dept']].append(i['Name'])
                      else:
                          x[i['Dept']] = [i['Name']]
                  
                  Output:
                  x -> {'0999': ['Tina'], '0123': ['Tom', 'Cheryl', 'Raj']}
                  

                  是否可以在字典理解或任何其他更pythonic的方式中实现上述逻辑?

                  Is it possible to implement the above logic in dict comprehension or any other more pythonic way?

                  推荐答案

                  dict 理解,即使不是不可能,也可能不是最好的选择.我可以建议使用 defaultdict (https://docs.python.org/2/library/collections.html#collections.defaultdict):

                  The dict comprehension, even though not impossible, might not be the best choice. May I suggest using defaultdict (https://docs.python.org/2/library/collections.html#collections.defaultdict):

                  from collections import defaultdict
                  dic = defaultdict(list)
                  for i in data:
                      dic[i['Dept']].append(i['Name'])
                  

                  这篇关于Python Dict 理解创建和更新字典的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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