>> I've been able to dig into this a little bit more and it
>> looks like django.utils.simplejson.decoder doesn't support
>> the '\x' escape character. Is this an intentional omission,
>> a bug in Django, or just me misunderstanding Python?
>
> JSON does not support the '\x' escape; see json.org for a full
> specification of what it allows.
Since a GUID isn't really a string, but a sequence of bytes
(which will be made more distinct in python3k, as it is in Java),
it should likely be encoded into JSON as an array of numbers.
Something like this might do the trick:
uuid = '3F2504E0-4F89-11D3-9A0C-0305E82C3301'
uuid = uuid.replace('-', '') # strip out the dashes
uuid_as_int_list = [
int('%s%s'%pair, 16)
for pair
in zip(uuid[::2], uuid[1::2])
]
and then use uuid_as_int_list to pass using JSON (which can then
be codified uneventfully).
The un-dash-ified version can be reconstituted with
''.join(hex(x)[2:].zfill(2) for x in uuid_as_int_list)
The "hex(x)[2:].zfill(2)" is a lazy way to use inbuilt python
functions to convert the decimal values back to two-character
hex-pairs.
If the string actually contains the bytes (which it sounds like
it does in your case), you can simply use
uuid = '?%\x04\xe0O\x89\x11\xd3\x9a\x0c\x03\x05\xe8,3\x01'
uuid_as_int_list = [ord(x) for x in uuid]
to and reconstitute it with
uuid = ''.join(chr(x) for x in uuid_as_int_list)
Or, if you prefer to pass the thing as a string instead of an
array of numbers, you can use
uuid = '?%\x04\xe0O\x89\x11\xd3\x9a\x0c\x03\x05\xe8,3\x01'
display_uuid = ''.join(hex(ord(x))[2:].zfill(2) for x in uuid)
to encode the hex-bytes as presentable characters.
If dashes then matter in the presentation form, I leave that as
an exercise to the reader. ;-)
-tim
[above example GUID pilfered from Wikipedia]
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