code: def pre_save(self, *args, **kwargs):
          "Returns field's value just before saving."
          value = super(CharField, self).pre_save(*args, **kwargs)
          return self.get_prep_value(valuef pre_save(self, *args, **kwargs):
          "Returns field's value just before saving."
          value = super(CharField, self).pre_save(*args, **kwargs)
          return self.get_prep_value(value)
docs: Returns field's value just before saving.