Fix syntax of exception throwing here and there

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

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()

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(