parameters: (self, f)
docstring: Called before writing each message to file f.
docstring_summary: Called before writing each message to file f.
docstring_tokens: Called before writing each message to file f .
function: def _pre_message_hook(self, f):
          """Called before writing each message to file f."""
          f.write('\014' + os.linesep)
function_tokens: def _pre_message_hook ( self , f ) : f . write ( '\014' + os . linesep )