New exception: RetryAfter

Also, small fix to the description text of ChatMigrated

telegram/error.py

@@ -94,8 +94,20 @@ class ChatMigrated(TelegramError):
         Args:
             new_chat_id (int):
 
-        Returns:
+        """
+        super(ChatMigrated,
+              self).__init__('Group migrated to supergroup. New chat id: {}'.format(new_chat_id))
+        self.new_chat_id = new_chat_id
+
+
+class RetryAfter(TelegramError):
+
+    def __init__(self, retry_after):
+        """
+        Args:
+            retry_after (int):
 
         """
-        super(ChatMigrated, self).__init__('Chat migrated')
-        self.new_chat_id = new_chat_id
+        super(RetryAfter,
+              self).__init__('Flood control exceeded. Retry in {} seconds'.format(retry_after))
+        self.retry_after = retry_after

telegram/utils/request.py

@@ -31,7 +31,8 @@ import urllib3
 from urllib3.connection import HTTPConnection
 
 from telegram import (InputFile, TelegramError)
-from telegram.error import Unauthorized, NetworkError, TimedOut, BadRequest, ChatMigrated
+from telegram.error import Unauthorized, NetworkError, TimedOut, BadRequest, ChatMigrated, \
+    RetryAfter
 
 logging.getLogger('urllib3').setLevel(logging.WARNING)
 
@@ -105,6 +106,9 @@ class Request(object):
                 migrate_to_chat_id = parameters.get('migrate_to_chat_id')
                 if migrate_to_chat_id:
                     raise ChatMigrated(migrate_to_chat_id)
+                retry_after = parameters.get('retry_after')
+                if retry_after:
+                    raise RetryAfter(retry_after)
             if description:
                 return description