目录

1. 从json文件读取数据

2. 将数据写入json文件

方法一：使用dump()函数

方法二：使用dumps()函数

完整代码

流程

json文件

Python 脚本

运行结果

控制台

base1.json

base2.json

---

 

1. 从json文件读取数据

 

使用load()函数获取json文件中的数据，并转换为Python的内置数据类型（列表或字典）。

下面自定义的函数read_json_file()实现了读取json文件数据的功能：

            
              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
                
              
            
          

 

2. 将数据写入json文件

 

方法一：使用dump()函数

dump()函数可以将Python中的列表或字典写入到json文件中。可选参数indent指定缩进。

下面自定义的函数write_json_file_a()将数据写入到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
                
              
            
          

 

方法二：使用dumps()函数

dumps()函数跟dump()函数的用法有所不同。dumps()先将Python列表或字典转换成特定的字符串格式，再借用open()和write()函数将转换后的数据写入到json文件中。可选参数indent指定缩进。

下面自定义的函数write_json_file_b()将数据写入到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
            
          

 

 

完整代码

 

流程

代码从base.json读取数据，再将读取后的数据分别写入base1.json文件（6缩进）和base2.json文件（4缩进）。

 

json文件

待读取的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"
  }
]
            
          

 

Python 脚本

Python脚本在获取到json数据后打印在控制台上。然后分别使用两种写json文件的方式写入数据。

            
              """
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)
                    
                  
                
              
            
          

 

 

运行结果

 

控制台

            
              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

            
          

 

base1.json

base1文件中采用了6缩进写入。

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

 

base2.json

base2文件中采用了4缩进写入。

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