目錄

1. 從json文件讀取數據

2. 將數據寫入json文件

方法一：使用dump()函數

方法二：使用dumps()函數

完整代碼

流程

json文件

Python 腳本

運行結果

控制臺

base1.json

base2.json

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1. 從json文件讀取數據

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使用load()函數獲取json文件中的數據，并轉換為Python的內置數據類型（列表或字典）。

下面自定義的函數read_json_file()實現了讀取json文件數據的功能：

            
              def read_json_file(url):
    """
    Get the data for the json file.
    :param url: 
              
                 json file path.
    :return: 
                
                   json file data.
    """
    with open(url, "r") as json_file:
        data = json.load(json_file)
    json_file.close()

    return data
                
              
            
          

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2. 將數據寫入json文件

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方法一：使用dump()函數

dump()函數可以將Python中的列表或字典寫入到json文件中。可選參數indent指定縮進。

下面自定義的函數write_json_file_a()將數據寫入到json文件中。

            
              def write_json_file_a(data):
    """
    Write Json file.
    :param data: 
              
                 data
    :return: 
                
                  
    """
    path = "base1.json"

    with open(path, "w") as json_file:
        json.dump(data, json_file, indent=6)
    json_file.close()
    print("Write %s success." % path)
    return
                
              
            
          

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方法二：使用dumps()函數

dumps()函數跟dump()函數的用法有所不同。dumps()先將Python列表或字典轉換成特定的字符串格式，再借用open()和write()函數將轉換后的數據寫入到json文件中。可選參數indent指定縮進。

下面自定義的函數write_json_file_b()將數據寫入到json文件中。

            
              def write_json_file_b(data):
    path = "base2.json"

    data = json.dumps(data, indent=4)
    open(path, "w").write(data)
    print("Write %s success." % path)
    return
            
          

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完整代碼

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流程

代碼從base.json讀取數據，再將讀取后的數據分別寫入base1.json文件（6縮進）和base2.json文件（4縮進）。

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json文件

待讀取的base.json如下所示：

            
              [
  {
    "name": "iphone X",
    "manufacturer": "Apple",
    "type": "mobile phone"
  },
  {
    "name": "HuaweiCloud",
    "manufacturer": "Huawei",
    "type": "Virtual cloud technology"
  },
  {
    "name": "Android",
    "manufacturer": "Google",
    "type": "mobile machines system"
  }
]
            
          

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Python 腳本

Python腳本在獲取到json數據后打印在控制臺上。然后分別使用兩種寫json文件的方式寫入數據。

            
              """
Note:
    Json actions demo.
    1. Get Json data.
    2. Write Json file.
"""

import json


def read_json_file(url):
    """
    Get the data for the json file.
    :param url: 
              
                 json file path.
    :return: 
                
                   json file data.
    """
    with open(url, "r") as json_file:
        data = json.load(json_file)
    json_file.close()

    return data


def write_json_file_a(data):
    """
    Write Json file.
    :param data: 
                  
                     data
    :return: 
                    
                      
    """
    path = "base1.json"

    with open(path, "w") as json_file:
        json.dump(data, json_file, indent=6)
    json_file.close()
    print("Write %s success." % path)
    return


def write_json_file_b(data):
    path = "base2.json"

    data = json.dumps(data, indent=4)
    open(path, "w").write(data)
    print("Write %s success." % path)
    return



if __name__ == "__main__":
    data = read_json_file("base.json")
    print("data: \n%s" % data)

    write_json_file_a(data)
    write_json_file_b(data)
                    
                  
                
              
            
          

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運行結果

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控制臺

            
              data: 
[{'name': 'iphone X', 'manufacturer': 'Apple', 'type': 'mobile phone'}, {'name': 'HuaweiCloud', 'manufacturer': 'Huawei', 'type': 'Virtual cloud technology'}, {'name': 'Android', 'manufacturer': 'Google', 'type': 'mobile machines system'}]
Write base1.json success.
Write base2.json success.

Process finished with exit code 0

            
          

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base1.json

base1文件中采用了6縮進寫入。

            
              [
      {
            "name": "iphone X",
            "manufacturer": "Apple",
            "type": "mobile phone"
      },
      {
            "name": "HuaweiCloud",
            "manufacturer": "Huawei",
            "type": "Virtual cloud technology"
      },
      {
            "name": "Android",
            "manufacturer": "Google",
            "type": "mobile machines system"
      }
]
            
          

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base2.json

base2文件中采用了4縮進寫入。

            
              [
    {
        "name": "iphone X",
        "manufacturer": "Apple",
        "type": "mobile phone"
    },
    {
        "name": "HuaweiCloud",
        "manufacturer": "Huawei",
        "type": "Virtual cloud technology"
    },
    {
        "name": "Android",
        "manufacturer": "Google",
        "type": "mobile machines system"
    }
]
            
          

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