python - 类型错误 : unbound method decode() must be called with JSONDecoder instance as first argument (got PrintJson instance instead)

Question

TypeError: unbound method decode() must be called with JSONDecoder instance as first argument (got PrintJson instance instead)

当我尝试将 python 对象解析为 json 时，出现此错误。

使用以下代码:

import json
from json import JSONDecoder

class TestJson():
    name = None
    pass

printJson = PrintJson()
print printJson
print JSONDecoder.decode(printJson) // at this line, getting this error

Answer 1

这是因为您正在调用 JSONDecoder 类上的方法，而不是它的实例上的方法。这会起作用:

from json import JSONDecoder()
JSONDecoder().decode('{}')