python中如何將多個json文件合並為一個文件

Question

我想將多個 json 文件合並到 python 中的一個文件中。我想做的是如果有幾個 .json 文件，例如：

# temp1.json
[{'num':'1', 'item':'smartphone','data':'2019-01-01'},
{'num':'2', 'item':'smartphone','data':'2019-01-02'},
{'num':'3', 'item':'smartphone','data':'2019-01-03'},
{'num':'4', 'item':'smartphone','data':'2019-01-04'}]

# temp2.json
[{'num':'5', 'item':'smartphone','data':'2019-01-05'},
{'num':'6', 'item':'smartphone','data':'2019-01-06'},
{'num':'7', 'item':'smartphone','data':'2019-01-07'}]

# temp3.json
[{'num':'8', 'item':'smartphone','data':'2019-01-08'},
{'num':'9', 'item':'smartphone','data':'2019-01-09'},
{'num':'10', 'item':'smartphone','data':'2019-01-10'},
{'num':'11', 'item':'smartphone','data':'2019-01-11'},
{'num':'12', 'item':'smartphone','data':'2019-01-12'}]

我想要得到的 result.json 文件應該是這樣的：

# result.json
[{'num':'1', 'item':'smartphone','data':'2019-01-01'},
{'num':'2', 'item':'smartphone','data':'2019-01-02'},
{'num':'3', 'item':'smartphone','data':'2019-01-03'},
{'num':'4', 'item':'smartphone','data':'2019-01-04'},
{'num':'5', 'item':'smartphone','data':'2019-01-05'},
{'num':'6', 'item':'smartphone','data':'2019-01-06'},
{'num':'7', 'item':'smartphone','data':'2019-01-07'},
{'num':'8', 'item':'smartphone','data':'2019-01-08'},
{'num':'9', 'item':'smartphone','data':'2019-01-09'},
{'num':'10', 'item':'smartphone','data':'2019-01-10'},
{'num':'11', 'item':'smartphone','data':'2019-01-11'},
{'num':'12', 'item':'smartphone','data':'2019-01-12'}]

我得到的result.json個文件是：

# result.json
[[{'num':'1', 'item':'smartphone','data':'2019-01-01'},
{'num':'2', 'item':'smartphone','data':'2019-01-02'},
{'num':'3', 'item':'smartphone','data':'2019-01-03'},
{'num':'4', 'item':'smartphone','data':'2019-01-04'}],
[{'num':'5', 'item':'smartphone','data':'2019-01-05'},
{'num':'6', 'item':'smartphone','data':'2019-01-06'},
{'num':'7', 'item':'smartphone','data':'2019-01-07'}],
[{'num':'8', 'item':'smartphone','data':'2019-01-08'},
{'num':'9', 'item':'smartphone','data':'2019-01-09'},
{'num':'10', 'item':'smartphone','data':'2019-01-10'},
{'num':'11', 'item':'smartphone','data':'2019-01-11'},
{'num':'12', 'item':'smartphone','data':'2019-01-12'}]]

我使用代碼從這里合並 .json 文件，並像下面這樣稍微改變它：

files=['my.json','files.json',...,'name.json']

def merge_JsonFiles(filename):
    result = list()
    for f1 in filename:
        with open(f1, 'r') as infile:
            result.append(json.load(infile))

    with open('counseling3.json', 'w') as output_file:
        json.dump(result, output_file)

merge_JsonFiles(files)

我已經閱讀了幾個相關問題，但沒有我需要的答案。 誰能幫我？

Answer 1

您應該使用extend而不是append 。 它會將傳遞的列表的項目添加到result而不是新列表：

files=['my.json','files.json',...,'name.json']

def merge_JsonFiles(filename):
    result = list()
    for f1 in filename:
        with open(f1, 'r') as infile:
            result.extend(json.load(infile))

    with open('counseling3.json', 'w') as output_file:
        json.dump(result, output_file)

merge_JsonFiles(files)

Answer 2

import json
import pandas as pd

with open('example1.json') as f1:               # open the file
    data1 = json.load(f1)

with open('example2.json') as f2:                # open the file       
    data2 = json.load(f2)
    
df1 = pd.DataFrame([data1])                      # Creating DataFrames
df2 = pd.DataFrame([data2])                      # Creating DataFrames

MergeJson = pd.concat([df1, df2], axis=1)         # Concat DataFrames

MergeJson.to_json("MergeJsonDemo.json")          # Writing Json

Answer 3

files=['my.json','files.json',...,'name.json']

with open('merged_file_name.json', "w") as outfile:
   outfile.write('{}'.format('\n'.join([open(f, "r").read() for f in files])))

Answer 4

還有另一種方法。只需將這些文件中的 json 文本加載為 python 列表，然后將它們添加在一起。 代碼如下。

# temp1.json
json_a = [{'num':'1', 'item':'smartphone','data':'2019-01-01'},
{'num':'2', 'item':'smartphone','data':'2019-01-02'},
{'num':'3', 'item':'smartphone','data':'2019-01-03'},
{'num':'4', 'item':'smartphone','data':'2019-01-04'}]

# temp2.json
json_b = [{'num':'5', 'item':'smartphone','data':'2019-01-05'},
{'num':'6', 'item':'smartphone','data':'2019-01-06'},
{'num':'7', 'item':'smartphone','data':'2019-01-07'}]

# temp3.json
json_c = [{'num':'8', 'item':'smartphone','data':'2019-01-08'},
{'num':'9', 'item':'smartphone','data':'2019-01-09'},
{'num':'10', 'item':'smartphone','data':'2019-01-10'},
{'num':'11', 'item':'smartphone','data':'2019-01-11'},
{'num':'12', 'item':'smartphone','data':'2019-01-12'}]

print(json_a + json_b + json_c)

輸出：

[{'num': '1', 'item': 'smartphone', 'data': '2019-01-01'},
 {'num': '2', 'item': 'smartphone', 'data': '2019-01-02'},
 {'num': '3', 'item': 'smartphone', 'data': '2019-01-03'},
 {'num': '4', 'item': 'smartphone', 'data': '2019-01-04'},
 {'num': '5', 'item': 'smartphone', 'data': '2019-01-05'},
 {'num': '6', 'item': 'smartphone', 'data': '2019-01-06'},
 {'num': '7', 'item': 'smartphone', 'data': '2019-01-07'},
 {'num': '8', 'item': 'smartphone', 'data': '2019-01-08'},
 {'num': '9', 'item': 'smartphone', 'data': '2019-01-09'},
 {'num': '10', 'item': 'smartphone', 'data': '2019-01-10'},
 {'num': '11', 'item': 'smartphone', 'data': '2019-01-11'},
 {'num': '12', 'item': 'smartphone', 'data': '2019-01-12'}]

Answer 5

如果目標是合並多個JSON文件，請嘗試以下操作：

def combine_jsons():
    file_list = ['first.json', 'second.json',... ,'last.json']
    all_data_dict = {}
    for json_file in file_list:
       with open(json_file,'r+') as file:
           # First we load existing data into a dict.
           file_data = json.load(file)
       all_data_dict.update(file_data)
    with open('merged_data.json', "w") as outfile:# save to json file
        json.dump(all_data_dict, outfile)

如果出於某種原因它必須是一個列表，只需更改最后一行

json.dump([all_data_dict], outfile)

基於How do I merge two dictionaries in a single expression (take union of dictionaries)?