PayloadManager: Fix docstring.

IPython/core/payload.py

@@ -1,55 +1,55 b''
 # -*- coding: utf-8 -*-
 """Payload system for IPython.
 
 Authors:
 
 * Fernando Perez
 * Brian Granger
 """
 
 #-----------------------------------------------------------------------------
 #       Copyright (C) 2008-2011 The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 from IPython.config.configurable import Configurable
 from IPython.utils.traitlets import List
 
 #-----------------------------------------------------------------------------
 # Main payload class
 #-----------------------------------------------------------------------------
 
 class PayloadManager(Configurable):
 
     _payload = List([])
 
     def write_payload(self, data, single=True):
         """Include or update the specified `data` payload in the PayloadManager.
 
-        If a previous payload with the same source than `data` exists
-        and `single` is True, it will be overwritten with the new one.
+        If a previous payload with the same source exists and `single` is True,
+        it will be overwritten with the new one.
         """
 
         if not isinstance(data, dict):
             raise TypeError('Each payload write must be a dict, got: %r' % data)
 
         if single and 'source' in data:
             source = data['source']
             for i, pl in enumerate(self._payload):
                 if 'source' in pl and pl['source'] == source:
                     self._payload[i] = data
                     return
 
         self._payload.append(data)
 
     def read_payload(self):
         return self._payload
 
     def clear_payload(self):
         self._payload = []