使用 Python 合并两个 json 文件，每个文件有多个 json 对象答案

【问题标题】：using Python Merge two json file with each file having multiple json objects使用 Python 合并两个 json 文件，每个文件有多个 json 对象
【发布时间】：2021-09-19 16:18:32
【问题描述】：

我对 Python 很陌生，我需要根据 "Id" 将两个 json 文件与多个 json 对象合并。

文件1.json

{"id": 1, "name": "Ault", "class": 8, "email": "ault@pynative.com"}
{"id": 2, "name": "john", "class": 8, "email": "jhon@pynative.com"}
{"id": 3, "name": "josh", "class": 8, "email": "josh@pynative.com"}
{"id": 4, "name": "emma", "class": 8, "email": "emma@pynative.com"}

文件2.json

{"id": 4, "math": "A", "class": 8, "physics": "D"}
{"id": 2, "math": "B", "class": 8, "physics": "C"}
{"id": 3, "math": "A", "class": 8, "physics": "A"}
{"id": 1, "math": "C", "class": 8, "physics": "B"}

json.loads(jsonObj) 和 json.load(path) 我都试过了。两者都抛出错误。我知道这两个文件作为一个整体（组合）都不是有效的 json，但文件中的每一行都是有效的 json。我想逐行阅读并合并两者。

【问题讨论】：

list1 = [json.loads(line) for line in open(path)] 然后你可以发布你的合并尝试（提示：这里有很多关于合并字典的问题）

标签： python json python-3.x object merge

【解决方案1】：

你可以逐行阅读然后解析

# asuming

# File1.json

# {"id": 1, "name": "Ault", "class": 8, "email": "ault@pynative.com"}
# {"id": 2, "name": "john", "class": 8, "email": "jhon@pynative.com"}
# {"id": 3, "name": "josh", "class": 8, "email": "josh@pynative.com"}
# {"id": 4, "name": "emma", "class": 8, "email": "emma@pynative.com"}

# File2.json

# {"id": 4, "math": "A", "class": 8, "physics": "D"}
# {"id": 2, "math": "B", "class": 8, "physics": "C"}
# {"id": 3, "math": "A", "class": 8, "physics": "A"}
# {"id": 1, "math": "C", "class": 8, "physics": "B"}


import json
merged = {}

with open('File1.json') as f:
    for line in f:
        jsonified = json.loads(line)
        merged[jsonified['id']] = jsonified
        
with open('File2.json') as f:
    for line in f:
        jsonified = json.loads(line)
        merged[jsonified['id']].update(jsonified) # asuming both file has same ids otherwise use try catch

merged = list(merged.values())
print(merged)

[{'id': 1,
  'name': 'Ault',
  'class': 8,
  'email': 'ault@pynative.com',
  'math': 'C',
  'physics': 'B'},
 {'id': 2,
  'name': 'john',
  'class': 8,
  'email': 'jhon@pynative.com',
  'math': 'B',
  'physics': 'C'},
 {'id': 3,
  'name': 'josh',
  'class': 8,
  'email': 'josh@pynative.com',
  'math': 'A',
  'physics': 'A'},
 {'id': 4,
  'name': 'emma',
  'class': 8,
  'email': 'emma@pynative.com',
  'math': 'A',
  'physics': 'D'}]

【讨论】：

【解决方案2】：

这是我使用pandas 对此的看法。

import pandas as pd
import os

os.chdir(os.getcwd())
file_path_1 = 'file1.json'
file_path_2 = 'file2.json'

df1 = pd.read_json(file_path_1, lines=True)
df2 = pd.read_json(file_path_2, lines=True)

df = df1.merge(df2, on='id')

print(df)

输出：

   id  name  class_x              email math  class_y physics
0   1  Ault        8  ault@pynative.com    C        8       B
1   2  john        8  jhon@pynative.com    B        8       C
2   3  josh        8  josh@pynative.com    A        8       A
3   4  emma        8  emma@pynative.com    A        8       D

【讨论】：