code: def is_valid(self):
          
          form = super(AuthenticateForm, self).is_valid()
          for f, error in self.errors.items():
              if f != "__all__":
                  self.fields[f].widget.attrs.update({"class": "error", "placeholder": ", ".join(list(error))})
              else:
                  errors = list(error)
                  if "This account is inactive." in errors:
                      message = "Intranet access restricted"
                  else:
                      message = "Invalid password"
                  self.fields["password"].widget.attrs.update({"class": "error", "placeholder": message})
  
          return form
docs: Validates the username and password in the form.