forms.py 文件源码

def clean_email(self):
        email = self.cleaned_data.get("email", "")
        try:
            auth.models.User.objects.get(email__iexact=email)
            raise forms.ValidationError(_("A user using that email address already exists."))
        except MultipleObjectsReturned:
            raise forms.ValidationError(_("A user using that email address already exists."))
        except auth.models.User.DoesNotExist:  # @UndefinedVariable
            pass

        return email