nl: 'EmailField', 'FileField', 'ImageField', 'URLField', 'BooleanField', 'NullBooleanField', 'ChoiceField', 'MultipleChoiceField', 'ComboField', 'MultiValueField', 'FloatField', 'DecimalField', 'SplitDateTimeField', 'IPAddressField', 'GenericIPAddressField', 'FilePathField', 'SlugField', 'TypedChoiceField', 'TypedMultipleChoiceField'. derive the class Field from the base class object.
code: class Field ( object ) :