在python中将json转换为字符串
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converting json to string in python
提问by BAE
I did not explain my questions clearly at beginning.
Try to use str()and json.dumps()when converting json to string in python.
一开始我没有把我的问题解释清楚。尝试在 python 中将 json 转换为字符串时使用str()和json.dumps()。
>>> data = {'jsonKey': 'jsonValue',"title": "hello world"}
>>> print json.dumps(data)
{"jsonKey": "jsonValue", "title": "hello world"}
>>> print str(data)
{'jsonKey': 'jsonValue', 'title': 'hello world'}
>>> json.dumps(data)
'{"jsonKey": "jsonValue", "title": "hello world"}'
>>> str(data)
"{'jsonKey': 'jsonValue', 'title': 'hello world'}"
My question is:
我的问题是：
>>> data = {'jsonKey': 'jsonValue',"title": "hello world'"}
>>> str(data)
'{\'jsonKey\': \'jsonValue\', \'title\': "hello world\'"}'
>>> json.dumps(data)
'{"jsonKey": "jsonValue", "title": "hello world\'"}'
>>>
My expected output: "{'jsonKey': 'jsonValue','title': 'hello world''}"
我的预期输出： "{'jsonKey': 'jsonValue','title': 'hello world''}"
>>> data = {'jsonKey': 'jsonValue',"title": "hello world""}
File "<stdin>", line 1
data = {'jsonKey': 'jsonValue',"title": "hello world""}
^
SyntaxError: EOL while scanning string literal
>>> data = {'jsonKey': 'jsonValue',"title": "hello world\""}
>>> json.dumps(data)
'{"jsonKey": "jsonValue", "title": "hello world\""}'
>>> str(data)
'{\'jsonKey\': \'jsonValue\', \'title\': \'hello world"\'}'
My expected output: "{'jsonKey': 'jsonValue','title': 'hello world\"'}"
我的预期输出： "{'jsonKey': 'jsonValue','title': 'hello world\"'}"
It is not necessary to change the output string to json (dict) again for me.
对于我来说，没有必要再次将输出字符串更改为 json (dict)。
How to do this?
这该怎么做？
采纳答案by alecxe
json.dumps()is much more than just making a string out of a Python object, it would always produce a valid JSONstring(assuming everything inside the object is serializable) following the Type Conversion Table.
json.dumps()不仅仅是从 Python 对象中生成一个字符串，它总是会在类型转换表之后生成一个有效的JSON字符串（假设对象内的所有内容都是可序列化的）。
For instance, if one of the values is None, the str()would produce an invalid JSON which cannot be loaded:
例如，如果其中一个值为None，str()则将产生一个无法加载的无效 JSON：
>>> data = {'jsonKey': None}
>>> str(data)
"{'jsonKey': None}"
>>> json.loads(str(data))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/__init__.py", line 338, in loads
return _default_decoder.decode(s)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 366, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 382, in raw_decode
obj, end = self.scan_once(s, idx)
ValueError: Expecting property name: line 1 column 2 (char 1)
But the dumps()would convert Noneinto nullmaking a valid JSON string that can be loaded:
但是dumps()会转换None为null可以加载的有效 JSON 字符串：
>>> import json
>>> data = {'jsonKey': None}
>>> json.dumps(data)
'{"jsonKey": null}'
>>> json.loads(json.dumps(data))
{u'jsonKey': None}
回答by Eugene Primako
There are other differences. For instance, {'time': datetime.now()}cannot be serialized to JSON, but can be converted to string. You should use one of these tools depending on the purpose (i.e. will the result later be decoded).
还有其他区别。例如，{'time': datetime.now()}不能序列化为 JSON，但可以转换为字符串。您应该根据目的使用这些工具之一（即稍后会解码结果）。
