Create a default module to use as a sentinel value

This looks better in the documentation than utils.Default,
cleans the utils with specific stuff like this, and users
may use it more easily.

telethon/client/messageparse.py

@@ -2,8 +2,8 @@ import itertools
 import re
 
 from .users import UserMethods
-from .. import utils
-from ..tl import types, custom
+from .. import default, utils
+from ..tl import types
 
 
 class MessageParseMethods(UserMethods):
@@ -62,7 +62,7 @@ class MessageParseMethods(UserMethods):
         """
         Returns a (parsed message, entities) tuple depending on ``parse_mode``.
         """
-        if parse_mode == utils.Default:
+        if parse_mode == default:
             parse_mode = self._parse_mode
         else:
             parse_mode = utils.sanitize_parse_mode(parse_mode)

telethon/client/messages.py

@@ -8,8 +8,8 @@ from async_generator import async_generator, yield_
 from .messageparse import MessageParseMethods
 from .uploads import UploadMethods
 from .buttons import ButtonMethods
-from .. import utils, helpers
-from ..tl import types, functions, custom
+from .. import default, helpers, utils
+from ..tl import types, functions
 
 __log__ = logging.getLogger(__name__)
 
@@ -360,7 +360,7 @@ class MessageMethods(UploadMethods, ButtonMethods, MessageParseMethods):
 
     async def send_message(
             self, entity, message='', *, reply_to=None,
-            parse_mode=utils.Default, link_preview=True, file=None,
+            parse_mode=default, link_preview=True, file=None,
             force_document=False, clear_draft=False, buttons=None,
             silent=None):
         """
@@ -584,7 +584,7 @@ class MessageMethods(UploadMethods, ButtonMethods, MessageParseMethods):
 
     async def edit_message(
             self, entity, message=None, text=None,
-            *, parse_mode=utils.Default, link_preview=True, file=None,
+            *, parse_mode=default, link_preview=True, file=None,
             buttons=None):
         """
         Edits the given message ID (to change its contents or disable preview).

telethon/client/uploads.py

@@ -5,11 +5,11 @@ import os
 import pathlib
 import re
 from io import BytesIO
-from mimetypes import guess_type
 
+from .buttons import ButtonMethods
 from .messageparse import MessageParseMethods
 from .users import UserMethods
-from .buttons import ButtonMethods
+from .. import default
 from .. import utils, helpers
 from ..tl import types, functions, custom
 
@@ -23,7 +23,7 @@ class UploadMethods(ButtonMethods, MessageParseMethods, UserMethods):
     async def send_file(
             self, entity, file, *, caption='', force_document=False,
             progress_callback=None, reply_to=None, attributes=None,
-            thumb=None, allow_cache=True, parse_mode=utils.Default,
+            thumb=None, allow_cache=True, parse_mode=default,
             voice_note=False, video_note=False, buttons=None, silent=None,
             **kwargs):
         """
@@ -180,7 +180,7 @@ class UploadMethods(ButtonMethods, MessageParseMethods, UserMethods):
 
     async def _send_album(self, entity, files, caption='',
                     progress_callback=None, reply_to=None,
-                    parse_mode=utils.Default, silent=None):
+                    parse_mode=default, silent=None):
         """Specialized version of .send_file for albums"""
         # We don't care if the user wants to avoid cache, we will use it
         # anyway. Why? The cached version will be exactly the same thing