How to use the zdict.constants.BASE_DIR function in zdict

def create_zdict_dir_if_not_exists():
    if not os.path.isdir(constants.BASE_DIR):
        os.mkdir(constants.BASE_DIR)

def create_zdict_dir_if_not_exists():
    if not os.path.isdir(constants.BASE_DIR):
        os.mkdir(constants.BASE_DIR)

def create_zdict_dir_if_not_exists():
    if not os.path.isdir(constants.BASE_DIR):
        os.mkdir(constants.BASE_DIR)

def create_zdict_dir_if_not_exists():
    if not os.path.isdir(constants.BASE_DIR):
        os.mkdir(constants.BASE_DIR)

import re

from zdict.constants import BASE_DIR
from zdict.dictionary import DictBase
from zdict.exceptions import NotFoundError, QueryError, APIKeyError
from zdict.models import Record


class OxfordDictionary(DictBase):
    """
    Docs:

    * https://developer.oxforddictionaries.com/documentation/
    """

    KEY_FILE = os.path.join(BASE_DIR, 'oxford.key')

    API = 'https://od-api.oxforddictionaries.com/api/v1/entries/en/{word}'

    # https://developer.oxforddictionaries.com/documentation/response-codes
    status_code = {
        200: 'Success!',
        400: 'The request was invalid or cannot be otherwise served.',
        403: 'The request failed due to invalid credentials.',
        404: 'No entry is found.',
        500: 'Something is broken. Please contact the Oxford Dictionaries '
             'API team to investigate.',
        502: 'Oxford Dictionaries API is down or being upgraded.',
        503: 'The Oxford Dictionaries API servers are up, but overloaded '
             'with requests. Please try again later.',
        504: 'The Oxford Dictionaries API servers are up, but the request '
             'couldn’t be serviced due to some failure within our stack. '