code: def format_html(format_string, *args, **kwargs):
      
      args_safe = map(conditional_escape, args)
      kwargs_safe = dict([(k, conditional_escape(v)) for (k, v) in
                          six.iteritems(kwargs)])
      return mark_safe(format_string.format(*args_safe, **kwargs_safe))
docs: Similar to str.format, but passes all arguments through conditional_escape,
      and calls 'mark_safe' on the result. This function should be used instead
      of str.format or % interpolation to build up small HTML fragments.