From 0e0e7f1c9e9ddc5e41c5378247bc53b90689f252 Mon Sep 17 00:00:00 2001
From: Lonami Exo <totufals@hotmail.com>
Date: Sat, 3 Mar 2018 14:59:30 +0100
Subject: [PATCH] Avoid unnecessary "or 0" in the session classes

---
 telethon/sessions/memory.py     | 4 ++--
 telethon/sessions/sqlalchemy.py | 3 +--
 telethon/sessions/sqlite.py     | 2 +-
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/telethon/sessions/memory.py b/telethon/sessions/memory.py
index df08bf22..e73e7688 100644
--- a/telethon/sessions/memory.py
+++ b/telethon/sessions/memory.py
@@ -29,7 +29,7 @@ class MemorySession(Session):
     def __init__(self):
         super().__init__()
 
-        self._dc_id = None
+        self._dc_id = 0
         self._server_address = None
         self._port = None
         self._auth_key = None
@@ -38,7 +38,7 @@ class MemorySession(Session):
         self._entities = set()
 
     def set_dc(self, dc_id, server_address, port):
-        self._dc_id = dc_id
+        self._dc_id = dc_id or 0
         self._server_address = server_address
         self._port = port
 
diff --git a/telethon/sessions/sqlalchemy.py b/telethon/sessions/sqlalchemy.py
index 933f44c2..d4e72f16 100644
--- a/telethon/sessions/sqlalchemy.py
+++ b/telethon/sessions/sqlalchemy.py
@@ -129,8 +129,7 @@ class AlchemySession(MemorySession):
             self._auth_key = AuthKey(data=session.auth_key)
 
     def clone(self, to_instance=None):
-        cloned = to_instance or self.__class__(self.container, self.session_id)
-        return super().clone(cloned)
+        return super().clone(MemorySession())
 
     def set_dc(self, dc_id, server_address, port):
         super().set_dc(dc_id, server_address, port)
diff --git a/telethon/sessions/sqlite.py b/telethon/sessions/sqlite.py
index 1170131e..c764cd21 100644
--- a/telethon/sessions/sqlite.py
+++ b/telethon/sessions/sqlite.py
@@ -198,7 +198,7 @@ class SQLiteSession(MemorySession):
             # multiple DCs. Probably done differently.
             c.execute('delete from sessions')
             c.execute('insert or replace into sessions values (?,?,?,?)', (
-                self._dc_id or 0,
+                self._dc_id,
                 self._server_address,
                 self._port,
                 self._auth_key.key if self._auth_key else b''