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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def toFormMarkup(self, form_tag_attrs=None):
 """Returns the form markup for this response. @param form_tag_attrs: Dictionary of attributes to be added to the form tag. 'accept-charset' and 'enctype' have defaults that can be overridden. If a value is supplied for 'action' or 'method', it will be replaced. @returntype: str @since: 2.1.0 """

        return self.fields.toFormMarkup(self.request.return_to,
                                        form_tag_attrs=form_tag_attrs)