class StdDev(expression, sample=False, **extra) [source] Returns the standard deviation of

class Lookup [source] A Lookup is a generic class to implement lookups. A lookup

Field.default The default value for the field. This can be a value or a callable object. If callable it will be called every

Options.default_manager_name New in Django 1.10. The

ordered True if the QuerySet is ordered — i.e. has an order_by() clause or a default

class TruncYear(expression, output_field=None, tzinfo=None, **extra) [source]

clear() Removes all objects from the related object set:

FieldFile.delete(save=True) [source] Deletes the file associated with this instance and clears

Options.ordering The default ordering for the object, for use when obtaining lists of objects:

Options.order_with_respect_to Makes this object orderable with respect to the given field, usually a ForeignKey