Fix Python 2-only raw_input call

[GitCop]

There were the following issues with your Pull Request

• Commit: 2e5dffa15e234e3212751da71d850a261f7793df
  • Commits must be in the following format: %{type}(%{scope}): %{description}

Guidelines are available at https://github.com/hfaran/piazza-api

---

This message was auto-generated by https://gitcop.com