def _add_doc(func, doc):
    func.__doc__ = doc
Helper function that returns a dictionary of all DateFields or
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/utils/six.py/_add_doc--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/contrib/databrowse/plugins/calendars.py/CalendarPlugin.field_dict