如何合并字典列表? [英] How to merge list of dictionaries?

问题描述

我在这里扩展我的原始问题:如何添加/合并列表字典?.

I'm extending my original question here: How to append/merge list of dictionaries?.

我正在尝试在单个包含列表的字典列表之间合并一些数据.如果"object"和"semver"键匹配，则会进行合并.如果匹配相同的值，还添加到其给定的部分"中.给定以下数据:

I'm trying to merge some data between a single List of dictionaries that has lists inside. Merging would happen based on the "object" and "semver" key if they matched. Also adding to their given "section" if the same value was matched. Given the following data:

data = [
        {
         "semver":"1.0.0",
         "sections":[
            {
               "name":"Add",
               "messages":[
                  "add: comment here"
               ]
            }
         ],
         "object":"files.sh"
      },
      {
         "semver":"1.0.0",
         "sections":[
            {
               "name":"Add",
               "messages":[
                  "add: Second comment here"
               ]
            }
         ],
         "object":"files.sh"
      },
      {
         "semver":"1.0.0",
         "sections":[
            {
               "name":"Fix",
               "messages":[
                  "Comment here"
               ]
            }
         ],
         "object":"files.sh"
      },
      {
         "semver":"2.0.0",
         "sections":[
            {
               "name":"Fix",
               "messages":[
                  "2.0.0 Fix Comment here"
               ]
            }
         ],
         "object":"files.sh"
      },
      {
         "semver":"2.0.0",
         "sections":[
            {
               "name":"Add",
               "messages":[
                  "2.0.0 Add Comment here"
               ]
            }
         ],
         "object":"files.sh"
      },
      {
         "semver":"2.0.0",
         "sections":[
            {
               "name":"Add",
               "messages":[
                  "2.0.0 comment for the NewFile"
               ]
            }
         ],
         "object":"NewFile.sh"
      },
]

我希望最终实现这一目标

I would like to achieve this as a end result

data = [
        {
         "semver":"1.0.0",
         "sections":[
            {
               "name":"Add",
               "messages":[
                  "add: comment here",
                  "add: Second comment here"
               ]
            },
            {
               "name":"Fix",
               "messages":[
                  "Fix: comment here"
               ]
            }
         ],
         "object":"files.sh"
      },
        {
         "semver":"2.0.0",
         "sections":[
            {
               "name":"Add",
               "messages":[
                  "2.0.0 Add comment here",
               ]
            },
            {
               "name":"Fix",
               "messages":[
                  "2.0.0 Fix Comment here"
               ]
            }
         ],
         "object":"files.sh"
      },
      {
         "semver":"2.0.0",
         "sections":[
            {
               "name":"Add",
               "messages":[
                  "2.0.0 comment for the NewFile"
               ]
            }
         ],
         "object":"NewFile.sh"
      },

]

代码块

objects = {}  # mapping for object: object_data with sections
sections = defaultdict(list)  # mapping for object: all sections
for d in data:
    print(d["semver"])
    for k, v in list(d.items()):
        if v == d["semver"]:
            try:
                section = d.pop("sections")
                sections[d["object"]].extend(section)
                objects[d["object"]] = d  # populate with object data without sections
            except Exception as e:
                print(e)
                pass

output = []
for object_name, object_data in objects.items():
    object_data["sections"] = sections[object_name]
    output.append(object_data)

到目前为止，我正在遍历dict中的每个k，v对，但是无法绕过两个版本之间的匹配并在循环中附加到该特定的dict上.

So far I am looping through each k,v pair in the dict's but can't wrap my head around matching between the two versions and appending to that specific dict in the loop.

推荐答案

有2个更改应做:

1. 根据元组表示的object和semver的组合将objects和sections中的键更改为.
2. 添加辅助功能以合并各节中的消息

1. changing the keys in objects and sections to be based on combination of object and semver represented by a tuple.
2. add an auxiliary function to merge the messages in sections

尝试一下:

import json  # just for pretty print, you don't have to use it
from collections import defaultdict


def merge_messages(sections):
    d = defaultdict(list)
    for m in sections:
        d[m["name"]].extend(m["messages"])
    return [{"name": k, "messages": v} for k, v in d.items()]


objects = {}  # mapping for data with sections for (object, semver) combinations
sections = defaultdict(list)  # mapping for sections data for (object, semver) combinations
for d in data:
    section = d.pop("sections")
    sections[(d["object"], d["semver"])].extend(section)  # extends the sections for the object
    objects[(d["object"], d["semver"])] = d  # # populate with object data without sections

# merge between sections and objects by object key
output = []
for comb, object_data in objects.items():
    object_data["sections"] = merge_messages(sections[comb])
    output.append(object_data)
print(json.dumps(output, indent=4))  # just for pretty print

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