doctestcompare.py 文件源码

def output_difference(self, example, got, optionflags):
        want = example.want
        parser = self.get_parser(want, got, optionflags)
        errors = []
        if parser is not None:
            try:
                want_doc = parser(want)
            except etree.XMLSyntaxError:
                e = sys.exc_info()[1]
                errors.append('In example: %s' % e)
            try:
                got_doc = parser(got)
            except etree.XMLSyntaxError:
                e = sys.exc_info()[1]
                errors.append('In actual output: %s' % e)
        if parser is None or errors:
            value = OutputChecker.output_difference(
                self, example, got, optionflags)
            if errors:
                errors.append(value)
                return '\n'.join(errors)
            else:
                return value
        html = parser is html_fromstring
        diff_parts = []
        diff_parts.append('Expected:')
        diff_parts.append(self.format_doc(want_doc, html, 2))
        diff_parts.append('Got:')
        diff_parts.append(self.format_doc(got_doc, html, 2))
        diff_parts.append('Diff:')
        diff_parts.append(self.collect_diff(want_doc, got_doc, html, 2))
        return '\n'.join(diff_parts)