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Justyna Julia Jamróz13,354 Points
What super() does?
Can someone explain step by step how the super() function works?
Jacqueline McKinney2,627 Points
There is a link in the Teacher's notes that should help https://docs.djangoproject.com/en/1.9/ref/forms/validation/#cleaning-and-validating-fields-that-depend-on-each-other
"...ensures that any validation logic in parent classes is maintained."
super().clean() is called to make sure that the clean method that is normally called on form.Form (the parent class), before you overwrote it, is still called and any validation that it was going to do is preserved. And then you are adding to it your own validation. If you don't call it then you are responsible for all of the checks that would normally happen if you did not overwrite the function clean().