About Dynamic Class or Function Loading
For reusable apps, you can easily make some classes or functions overwritable in the settings, by defining their paths there. You can load them with the import_string() utility.
registration/views.py
from django.conf import settings
from django.utils.module_loading import import_string
from .forms import DefaultRegistrationForm
if hasattr(settings, "REGISTRATION_FORM"):
form_class = import_string(settings.REGISTRATION_FORM)
else:
form_class = DefaultRegistrationForm
settings.py
REGISTRATION_FORM = "accounts.forms.CustomRegistrationForm"
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