Django rest framework uszipcode field

zipcode.py

from rest_framework.fields import RegexField
from localflavor.us.forms import USZipCodeField as FormUSZipCodeField

class USZipCodeField(RegexField):
    """"
    A form field that validates input as a U.S. ZIP code. Valid formats are
    XXXXX or XXXXX-XXXX.
    .. note::
        If you are looking for a form field with a list of U.S. Postal Service
        locations please use :class:`~localflavor.us.forms.USPSSelect`.
    .. versionadded:: 1.1
    Whitespace around the ZIP code is accepted and automatically trimmed.
    """
    type_name = 'USZipCodeField'
    type_label = 'zipcode'
    form_field_class = FormUSZipCodeField
    default_error_messages = {
        'invalid': _('Enter a zip code in the format XXXXX or XXXXX-XXXX.'),
    }

    def __init__(self, regex, max_length=None, min_length=None, *args, **kwargs):
        super(USZipCodeField, self).__init__(r'^\d{5}(?:-\d{4})?$',
                                             max_length, min_length, *args, **kwargs)