将Unicode字符串转换为UTF-8，然后转换为JSON

Question

I want to encode a string in UTF-8 and view the corresponding UTF-8 bytes individually. In the Python REPL the following seems to work fine:

>>> unicode('©', 'utf-8').encode('utf-8')
'\xc2\xa9'

Note that I'm using U+00A9 COPYRIGHT SIGN as an example here. The '\\xC2\\xA9' looks close to what I want — a string consisting of two separate code points: U+00C2 and U+00A9. (When UTF-8-decoded, it gives back the original string, '\\xA9' .)

Then, I want the UTF-8-encoded string to be converted to a JSON-compatible string. However, the following doesn't seem to do what I want:

>>> import json; json.dumps('\xc2\xa9')
'"\\u00a9"'

Note that it generates a string containing U+00A9 (the original symbol). Instead, I need the UTF-8-encoded string, which would look like "\Â\©" in valid JSON.

TL;DR How can I turn '©' into "\Â\©" in Python? I feel like I'm missing something obvious — is there no built-in way to do this?

Answer 1

If you really want "\Â\©" as the output, give json a Unicode string as input.

>>> print json.dumps(u'\xc2\xa9')
"\u00c2\u00a9"

You can generate this Unicode string from the raw bytes:

s = unicode('©', 'utf-8').encode('utf-8')
s2 = u''.join(unichr(ord(c)) for c in s)

I think what you really want is "\\xc2\\xa9" as the output, but I'm not sure how to generate that yet.