我如何在python中创建空的json对象
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/16436133/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How can i create the empty json object in python
提问by user2330497
I have this code
我有这个代码
json.loads(request.POST.get('mydata',dict()))
But i get this error
但我收到这个错误
No JSON object could be decoded
I just want that if don't have mydatain POST then i don't get that error
我只是希望如果mydata在 POST 中没有，那么我就不会收到那个错误
采纳答案by defuz
Simply:
简单地：
json.loads(request.POST.get('mydata', '{}'))
Or:
或者：
data = json.loads(request.POST['mydata']) if 'mydata' in request.POST else {}
Or:
或者：
if 'mydata' in request.POST:
data = json.loads(request.POST['mydata'])
else:
data = {} # or data = None
回答by Bibhas Debnath
loads()takes a json formatted string and turns it into a Python object like dict or list. In your code, you're passing dict()as default value if mydatadoesn't exist in request.POST, while it should be a string, like "{}". So you can write -
loads()接受一个 json 格式的字符串并将其转换为 Python 对象，如 dict 或 list。在您的代码中，dict()如果mydata中不存在request.POST，则作为默认值传递，而它应该是一个字符串，例如"{}". 所以你可以写 -
json_data = json.loads(request.POST.get('mydata', "{}"))
Also remember, the value of request.POST['mydata']must be JSON formatted, or else you'll get the same error.
还要记住， 的值request.POST['mydata']必须是 JSON 格式，否则你会得到同样的错误。
