ModelForm is also a python class with a similar behavior as the other classes.
#Inherits from ModelForm class
class ParentModelForm(forms.ModelForm):
...
...
def save(self, *args, **kwargs):
...
...
#Inherits from ParentModelForm
class ChildModelForm(ParentModelForm):
..
..
#You would have to override the Meta class
class Meta:
model = Child
def save(self, *args, **kwargs):
#Calling the parent model form save method
super(ChildModelForm, self).save(*args, **kwargs)