It's almost overkill to bother with a library.

  #!/usr/bin/env python3
  import time, hmac, base64, struct
  def totp(seed,curtime,period,len):
      k = base64.b32decode(seed)
      mac = hmac.new(k, struct.pack('>Q', int(curtime/period)), 'sha1').digest()
      offset=mac[-1] & 0x0f
      otp=struct.unpack('>L', mac[offset:offset+4])[0] & 0x7fffffff
      return str(otp)[-len:].zfill(len)

  myseed='KRUGS4ZANFZSAYJAOJQW4ZDPNUQHG5DS' # use gpg or similar to store
  print(totp(myseed,time.time(),60,6))