code: def is_file_url(url):
      
      from .misc import to_text
  
      if not url:
          return False
      if not isinstance(url, six.string_types):
          try:
              url = getattr(url, "url")
          except AttributeError:
              raise ValueError("Cannot parse url from unknown type: {0!r}".format(url))
      url = to_text(url, encoding="utf-8")
      return urllib_parse.urlparse(url.lower()).scheme == "file"
docs: Returns true if the given url is a file url