Fixing python 3.4 compatibility support. Possible issue with circular imports (https://docs.python.org/3/whatsnew/3.5.html#other-language-changes) which is handled ok it 3.5+ and is giving an error in 3.4

telethon/crypto/auth_key.py

@@ -1,7 +1,7 @@
 import struct
 from hashlib import sha1
 
-from .. import helpers as utils
+from ..helpers import calc_msg_key
 from ..extensions import BinaryReader
 
 
@@ -20,4 +20,4 @@ class AuthKey:
         """
         new_nonce = new_nonce.to_bytes(32, 'little', signed=True)
         data = new_nonce + struct.pack('<BQ', number, self.aux_hash)
-        return utils.calc_msg_key(data)
+        return calc_msg_key(data)

telethon/telegram_bare_client.py

@@ -8,7 +8,8 @@ from io import BytesIO
 from threading import Lock
 from time import sleep
 
-from . import helpers as utils
+from .helpers import generate_random_long, ensure_parent_dir_exists
+
 from .crypto import rsa, CdnDecrypter
 from .errors import (
     RPCError, BrokenAuthKeyError, ServerError,
@@ -600,7 +601,7 @@ class TelegramBareClient:
         is_large = file_size > 10 * 1024 * 1024
         part_count = (file_size + part_size - 1) // part_size
 
-        file_id = utils.generate_random_long()
+        file_id = generate_random_long()
         hash_md5 = md5()
 
         stream = open(file, 'rb') if isinstance(file, str) else BytesIO(file)
@@ -678,7 +679,7 @@ class TelegramBareClient:
 
         if isinstance(file, str):
             # Ensure that we'll be able to download the media
-            utils.ensure_parent_dir_exists(file)
+            ensure_parent_dir_exists(file)
             f = open(file, 'wb')
         else:
             f = file

telethon_generator/tl_generator.py

@@ -127,10 +127,10 @@ class TLGenerator:
                 # so they all can be serialized and sent, however, only the
                 # functions are "content_related".
                 builder.writeln(
-                    'from {}.tl.tlobject import TLObject'.format('.' * depth)
+                    'from telethon.tl.tlobject import TLObject'.format('.' * depth)
                 )
                 builder.writeln(
-                        'from {}.tl import types'.format('.' * depth)
+                        'import telethon.tl.types'.format('.' * depth)
                 )
 
                 # Add the relative imports to the namespaces,