code: def tell(self):
          "get the file descriptor's position relative to the file's beginning"
          with _fdopen(os.dup(self._fileno)) as fp:
              return fp.tell(f tell(self):
          "get the file descriptor's position relative to the file's beginning"
          with _fdopen(os.dup(self._fileno)) as fp:
              return fp.tell()
docs: get the file descriptor's position relative to the file's beginning