Only fetch NIST dump in gzip format when populating due to:

import configparser

import urllib.parse

import urllib.request as req

from io import BytesIO

import gzip

class Configuration():

    ConfigParser = configparser.ConfigParser()

            auth = req.HTTPBasicAuthHandler()

            opener = req.build_opener(proxy, auth, req.HTTPHandler)

            req.install_opener(opener)

        return req.urlopen(getfile)

        response = req.urlopen(getfile + '.gz')

        if 'gzip' in response.info().get('Content-Type'):

            buf = BytesIO(response.read())

            response = gzip.GzipFile(fileobj=buf)

        return response