From 0ef32a7d78e0296102a3a97baba229b74f34f159 Mon Sep 17 00:00:00 2001
From: "Dmitry D. Chernov" <blackdoomer@yandex.ru>
Date: Fri, 19 May 2017 15:48:01 +1000
Subject: [PATCH] Fix syntax of exception throwing here and there

---
 telethon/interactive_telegram_client.py | 2 +-
 telethon/network/tcp_client.py          | 4 ++--
 telethon/telegram_client.py             | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/telethon/interactive_telegram_client.py b/telethon/interactive_telegram_client.py
index bfa28a73..4393cfa1 100644
--- a/telethon/interactive_telegram_client.py
+++ b/telethon/interactive_telegram_client.py
@@ -64,7 +64,7 @@ class InteractiveTelegramClient(TelegramClient):
                             'Two step verification is enabled. Please enter your password: ')
                         code_ok = self.sign_in(password=pw)
                     else:
-                        raise e
+                        raise
 
     def run(self):
         # Listen for updates
diff --git a/telethon/network/tcp_client.py b/telethon/network/tcp_client.py
index 5545ecdf..bb9bc2e9 100755
--- a/telethon/network/tcp_client.py
+++ b/telethon/network/tcp_client.py
@@ -84,7 +84,7 @@ class TcpClient:
                         partial = self.socket.recv(left_count)
                         writer.write(partial)
 
-                    except BlockingIOError:
+                    except BlockingIOError as error:
                         # There was no data available for us to read. Sleep a bit
                         time.sleep(self.delay)
 
@@ -93,7 +93,7 @@ class TcpClient:
                             time_passed = datetime.now() - start_time
                             if time_passed > timeout:
                                 raise TimeoutError(
-                                    'The read operation exceeded the timeout.')
+                                    'The read operation exceeded the timeout.') from error
 
                 # If everything went fine, return the read bytes
                 return writer.get_bytes()
diff --git a/telethon/telegram_client.py b/telethon/telegram_client.py
index 0db78847..320ca5db 100644
--- a/telethon/telegram_client.py
+++ b/telethon/telegram_client.py
@@ -173,7 +173,7 @@ class TelegramClient:
 
         except InvalidDCError as error:
             if throw_invalid_dc:
-                raise error
+                raise
 
             self.reconnect_to_dc(error.new_dc)
             return self.invoke(request, timeout=timeout, throw_invalid_dc=True)
@@ -216,7 +216,7 @@ class TelegramClient:
                     print(error)
                     return False
                 else:
-                    raise error
+                    raise
         elif password:
             salt = self.invoke(GetPasswordRequest()).current_salt
             result = self.invoke(