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On Aug 30, 2014, at 07:34 PM, Ethan Furman wrote:
>In other words, this was a bug that no one noticed for many many releases,
>and I'm not sure we should fix it in 2.7 now.
>
>Arguments for fixing?
-1 on fixing it, but we *can* document workarounds. Here's what I use in
Mailman 3.
class ExtendedEncoder(json.JSONEncoder):
 """An extended JSON encoder which knows about other data types."""
 def default(self, obj):
 if isinstance(obj, datetime):
 return obj.isoformat()
 elif isinstance(obj, timedelta):
 # as_timedelta() does not recognize microseconds, so convert these
 # to floating seconds, but only if there are any seconds.
 if obj.seconds > 0 or obj.microseconds > 0:
 seconds = obj.seconds + obj.microseconds / 1000000.0
 return '{0}d{1}s'.format(obj.days, seconds)
 return '{0}d'.format(obj.days)
 elif isinstance(obj, Enum):
 # It's up to the decoding validator to associate this name with
 # the right Enum class.
 return obj.name
 return json.JSONEncoder.default(self, obj)
(Frankly, I wish it was easier to extend the encoder, e.g. by registering
callbacks for non-standard types.)
I don't automatically decode enums because on PUTs, POSTs, and PATCHs, I know
which attributes should be enums, so I can convert them explicitly when I
validate input forms.