问题
I am creating a json body for a REST payload body like so:
>>> j = json.loads('["foo", {"bar": ["to_be_replaced", 1.1, 1.0, 2]}]')
>>> text = "aaaa" + "\\" + "bbbbb" + "\\" + "cccc"
>>> j[1]["bar"][0] = text
>>> j
['foo', {'bar': ['aaaa\\bbbbb\\cccc', 1.1, 1.0, 2]}]
Annoyingly, the format expected on the other side is like so
"aaaa\bbbb\cccc".
A terrible idea, I know.
I have tried everything and am starting to believe it's simply impossible to store text in this format in a json object. Is there a way? Or do I need to get the developers of the webservice to choose a more sensible delimiter.
I know it's REALLY a single backslash and if I do a print a get a single backslash
>>> print(text)
aaaa\bbbbb\cccc
But that doesn't help me get it into a json object.
回答1:
Yes, it is impossible -- by design.
A JSON parser is, by nature, supposed to emit only valid JSON. From RFC 8259, emphasis mine:
7. Strings
The representation of strings is similar to conventions used in the C family of programming languages. A string begins and ends with quotation marks. All Unicode characters may be placed within the quotation marks, except for the characters that MUST be escaped: quotation mark, reverse solidus, and the control characters (U+0000 through U+001F).
Any character may be escaped. If the character is in the Basic Multilingual Plane (U+0000 through U+FFFF), then it may be represented as a six-character sequence: a reverse solidus, followed by the lowercase letter u, followed by four hexadecimal digits that encode the character's code point. The hexadecimal letters A through F can be uppercase or lowercase. So, for example, a string containing only a single reverse solidus character may be represented as "\u005C".
Alternatively, there are two-character sequence escape representations of some popular characters. So, for example, a string containing only a single reverse solidus character may be represented more compactly as
"\\".
Note the phrase "MUST be escaped" -- "MUST" is a formally-defined term-of-art; something which does not comply with a MUST requirement from the JSON specification is not allowed to call itself JSON.
In summary: A string containing only a literal backslash in your data may be encoded in JSON as "\u005c", or "\\". It may not be encoded as "\" (including that character as an unescaped literal).
来源：https://stackoverflow.com/questions/49763394/impossible-to-store-json-in-python-with-single-un-escaped-backslash