From a43c6c2b680bb11a3cd8fdd0976f4a2fae2d5ed9 Mon Sep 17 00:00:00 2001
From: Lonami Exo <totufals@hotmail.com>
Date: Tue, 26 Jun 2018 10:54:26 +0200
Subject: [PATCH] Work around Python 3.5.2 bug causing 100% CPU load on
 script's end

---
 telethon/client/telegrambaseclient.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/telethon/client/telegrambaseclient.py b/telethon/client/telegrambaseclient.py
index 5e9fe4f2..783349b2 100644
--- a/telethon/client/telegrambaseclient.py
+++ b/telethon/client/telegrambaseclient.py
@@ -297,6 +297,16 @@ class TelegramBaseClient(abc.ABC):
 
         self.session.close()
 
+    def __del__(self):
+        # Python 3.5.2's ``asyncio`` mod seems to have a bug where it's not
+        # able to close the pending tasks properly, and letting the script
+        # complete without calling disconnect causes the script to trigger
+        # 100% CPU load. Call disconnect to make sure it doesn't happen.
+        if self._loop.is_running():
+            self._loop.create_task(self.disconnect())
+        else:
+            self._loop.run_until_complete(self.disconnect())
+
     async def _switch_dc(self, new_dc):
         """
         Permanently switches the current connection to the new data center.