old_contents: # -*- 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, update=False):
          if not isinstance(data, dict):
              raise TypeError('Each payload write must be a dict, got: %r' % data)
  
          if update 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 = []
  
new_contents: # -*- 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, update=False):
          if not isinstance(data, dict):
              raise TypeError('Each payload write must be a dict, got: %r' % data)
  
          if update 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 = []
  
subject: Fix style