def clean(self, value):
        value = super(INPhoneNumberField, self).clean(value)
        if value in EMPTY_VALUES:
            return ''
        value = force_text(value)
        m = phone_digits_re.match(value)
        if m:
            return '%s' % (value)
        raise ValidationError(self.error_messages['invalid'])
dataset/ETHPy150Open django/django-localflavor/localflavor/in_/forms.py/INPhoneNumberField.clean/original