def switch(self, dest, url, rev_options):
        repo_config = os.path.join(dest, self.dirname, 'hgrc')
        config = configparser.SafeConfigParser()
        try:
            config.read(repo_config)
            config.set('paths', 'default', url)
            with open(repo_config, 'w') as config_file:
                config.write(config_file)
        except (__HOLE__, configparser.NoSectionError) as exc:
            logger.warning(
                'Could not switch Mercurial repository to %s: %s', url, exc,
            )
        else:
            self.run_command(['update', '-q'] + rev_options, cwd=dest)
dataset/ETHPy150Open pypa/pip/pip/vcs/mercurial.py/Mercurial.switch