def update_widget_attrs(self, bound_field, attrs):
bound_field.form.update_widget_attrs(bound_field, attrs)<EOL>widget_classes = self.widget.attrs.get('<STR_LIT:class>', None)<EOL>if widget_classes:<EOL><INDENT>if '<STR_LIT:class>' in attrs:<EOL><INDENT>attrs['<STR_LIT:class>'] += '<STR_LIT:U+0020>' + widget_classes<EOL><DEDENT>else:<EOL><INDENT>attrs.update({'<STR_LIT:class>': widget_classes})<EOL><DEDENT><DEDENT>return attrs<EOL>
Update the dictionary of attributes used  while rendering the input widget