写入JSON会产生TypeError:dump()至少接受2个参数(给定1个) [英] Writing to JSON produces TypeError: dump() takes at least 2 arguments (1 given)

问题描述

我正在尝试加载json文件.更新并写回.这是我的尝试，但出现错误:

I am trying to load in a json file. Update it and write it back. Here is my attempt at it but I am getting an error:

TypeError:dump()至少接受2个参数(给定1个参数)

TypeError: dump() takes at least 2 arguments (1 given)

with open('employees.json') as data_file:
    employees = json.load(data_file)
    data_file.close

employees['employees'].append({
    "id": "2",
    "name": "Rob Croft",
    "key": "0003837852"})

with open('employees.json', 'w') as data_file:
    json.dump(employees)
    data_file.close

推荐答案

您忘记了传递文件对象:

You forgot to pass in the file object:

json.dump(employees, data_file)

由于使用with语句将文件对象用作上下文管理器，因此不需要手动关闭文件.而且完全 只是使用data_file.close是多余的，因为您甚至没有调用 file.close()方法.

Since you are using the file object as a context manager with the with statement, you do not need to manually close the file. And using just data_file.close is entirely redundant since you are not even calling the file.close() method.

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