code: def file(cls, uri_or_path):
          
          uri = urlparse(uri_or_path)
          if not uri.scheme:
              # Just a normal path
              return open(uri_or_path, 'rb')
          else:
              it = cls(uri_or_path).download_iter(uri.path.lstrip('/'), skip_hash=True)
              if not it:
                  raise ValueError('{0} not found'.format(uri_or_path))
              tmp = tempfile.TemporaryFile()
              for chunk in it:
                  tmp.write(chunk)
              tmp.seek(0, 0)
              return tmp
docs: Given either a URI like s3://bucket/path.txt or a path like /path.txt,
          return a file object for it.