u'''Load a readline history file. The default filename is ~/.history.

def read_history_file(self, filename=None): 
        u'''Load a readline history file. The default filename is ~/.history.'''
        if filename is None:
            filename = self.mode._history.history_filename
        log(u"read_history_file from %s"%ensure_unicode(filename))
        self.mode._history.read_history_file(filename)