Fetch the authenticator code so it is usable in a script.

authenticator_code.py

#!/usr/bin/env python3

import authenticator as a
import os


def get_code():
    cd = (a.data
          .ClientFile(
            os.environ['AUTHENTICATOR_PASSWORD'])
          .load(
            os.path.expanduser('~/.authenticator/authenticator.data')
          )[0])
    return (a.hotp.HOTP()
            .generate_code_from_time(
                 cd.shared_secret(),
                 code_length=cd.password_length(),
                 period=cd.period())[0])


try:
    os.environ['AUTHENTICATOR_PASSWORD']
except KeyError:
    raise SystemExit("### Please set AUTHENTICATOR_PASSWORD")

print(get_code())