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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 render_select_site_form(self, request, context, form_url=''):
 """ Render the site choice form. """

        app_label = self.opts.app_label
        context.update({
            'has_change_permission': self.has_change_permission(request),
            'form_url': mark_safe(form_url),
            'opts': self.opts,
            'add': True,
            'save_on_top': self.save_on_top,
        })

        return render_to_response(self.select_site_form_template or [
            'admin/%s/%s/select_site_form.html' % (app_label, self.opts.object_name.lower()),
            'admin/%s/select_site_form.html' % app_label,
            'admin/usersettings/select_site_form.html',  # added default here
            'admin/select_site_form.html'
        ], context)