If you use filter(), you typically do this whenever you expect 
more than just one object that matches your criteria. 
If no item was found matching your criteria, filter() 
returns am empty queryset without throwing an error.

If you use get(), you expect one (and only one) item that 
matches your criteria. Get throws an error if the item does 
not exist or if multiple items exist that match your criteria. 
You should therefore always use if in a try.. except .. block 
or with a shortcut function like get_object_or_404 in order to 
handle the exceptions properly.