Remove a use of exec (#35624)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35624
Python 2 has reached end-of-life and is no longer supported by PyTorch.
This test case is valid syntax in Python 3.
Test Plan: CI
Differential Revision: D20842877
Pulled By: dreiss
fbshipit-source-id: 856e72171496aa1d517f2f27a8a5066462cf4f76
