为什么json.dumps使用"\ uxxxx"转义非ascii字符? [英] Why does json.dumps escape non-ascii characters with "\uxxxx"

问题描述

在Python 2中，函数json.dumps()将确保所有非ASCII字符都被转义为\uxxxx.

In Python 2, the function json.dumps() will ensure that all non-ascii characters are escaped as \uxxxx.

Python 2 Json

但这不是很令人困惑，因为\uxxxx是Unicode字符，应在Unicode字符串内使用.

But isn't this quite confusing because \uxxxx is a unicode character and should be used inside a unicode string.

json.dumps()的输出是一个str，它是Python 2中的字节字符串.因此，它不应该转义\xhh这样的字符吗?

The output of json.dumps() is a str, which is a byte string in Python 2. And thus shouldn't it escape characters as \xhh ?

>>> unicode_string = u"\u00f8"
>>> print unicode_string
ø
>>> print json.dumps(unicode_string)
"\u00f8"
>>> unicode_string.encode("utf8")
'\xc3\xb8'

推荐答案

这就是重点.您会得到一个字节字符串，而不是Unicode字符串.因此，Unicode字符需要转义才能生存. JSON允许转义，因此提供了一种表示Unicode字符的安全方式.

That's exactly the point. You get a byte string back, not a Unicode string. Thus the Unicode characters need to be escaped to survive. The escaping is allowed by JSON and thus presents a safe way of representing Unicode characters.

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