> 2006/7/31, siniy <msi...@gmail.com>:
> > I know that isinstance(o, datetime.date) returns "True" even "o" is a
> > datetime object. But I don't know - may be it's a python bug? My python
> > version 2.4.3 from Ubuntu Dapper.

> I can confirm this behaviour with Debian Testing's Python 2.3.5 too.

>     def default(self, o):
>         if isinstance(o, datetime.date):
>             return o.strftime(self.DATE_FORMAT)
>         elif isinstance(o, datetime.time):
>             return o.strftime(self.TIME_FORMAT)
>         elif isinstance(o, datetime.datetime):
>            return o.strftime("%s %s" % (self.DATE_FORMAT,
> self.TIME_FORMAT))
>    ....

> I know that isinstance(o, datetime.date) returns "True" even "o" is a
> datetime object. But I don't know - may be it's a python bug? My python
> version 2.4.3 from Ubuntu Dapper. So I replace parts of django code and
> all works as I want:

> siniy wrote:
> > Hi all,
> > I've downloaded today a new release of Django and played with json
> > serialization. I found that if you use DateTime field the resulting
> > json string contains only date, but not all datetime. So I viewed a
> > source code of django/core/serializers/json.py and found that:

> >     def default(self, o):
> >         if isinstance(o, datetime.date):
> >             return o.strftime(self.DATE_FORMAT)
> >         elif isinstance(o, datetime.time):
> >             return o.strftime(self.TIME_FORMAT)
> >         elif isinstance(o, datetime.datetime):
> >            return o.strftime("%s %s" % (self.DATE_FORMAT,
> > self.TIME_FORMAT))
> >       ....

> > I know that isinstance(o, datetime.date) returns "True" even "o" is a
> > datetime object. But I don't know - may be it's a python bug? My python
> > version 2.4.3 from Ubuntu Dapper. So I replace parts of django code and
> > all works as I want:

> no, it's not a bug.

> datetime.datetime inherits from datetime.

>  >>> datetime.datetime.__mro__
> (<type 'datetime.datetime'>, <type 'datetime.date'>, <type 'object'>)

> (mro is method-resolution-order)

> as you see 'datetime' inherits from 'date', which inherits from 'object'.

> and if you check the python-help, you'll see that
> isinstance "Return whether an object is an instance of a class or of a
> subclass thereof".

> and because datetime is a subclass of date, isinstance returns True.

> maybe you could try this:

> if type(o) == type(datetime.datetime):
>         // your code here

>> datetime.datetime inherits from datetime.

> Definetly not

> Jyrki Pulliainen wrote:
> > 2006/7/31, Gábor Farkas <ga...@nekomancer.net>:

> >> datetime.datetime inherits from datetime.

> > Definetly not

> sorry, of course i meant

> "datetime.datetime inherits from datetime.time"