Augmented JSON encoder

utils.py

from django.utils.encoding import force_unicode
from django.utils import datetime_safe
from django.utils.functional import Promise
import django.utils.simplejson as json
import datetime

class AugmentedJSONEncoder(json.JSONEncoder):
    """
    Augmentation for simplejson encoder.
    Now additionally encodes arbitrary iterables, class instances, decimals,
    lazy translations, dates, times and datetimes.

    Usage: json.dumps(data, cls=AugmentedJSONEncoder)
    """
 
    DATE_FORMAT = "%Y-%m-%d"
    TIME_FORMAT = "%H:%M:%S"
 
    def default(self, o):
        if(hasattr(o, "__iter__")):
            iterable = iter(o)
            return list(iterable)
        elif(hasattr(o, "__add__") and hasattr(o, "__sub__") and hasattr(o, "__mul__")):
            return float(o)
        elif isinstance(o, datetime.datetime):
            d = datetime_safe.new_datetime(o)
            return d.isoformat()
        elif isinstance(o, datetime.date):
            d = datetime_safe.new_date(o)
            return d.strftime(self.DATE_FORMAT)
        elif isinstance(o, datetime.time):
            return o.strftime(self.TIME_FORMAT)
        elif isinstance(o, Promise):
            return force_unicode(o)
        elif(hasattr(o, "__class__")):
            return o.__dict__
        else:
            return str(o)