put interactive prompt in bash (#15521)
Summary:
This makes compatibility with different versions of python a little bit simpler, and fixes a problem where stdin wasn't being read from the terminal properly in the prompt.
zdevito This should fix your EOF exception.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15521
Differential Revision: D13546358
Pulled By: suo
fbshipit-source-id: fb7551a86c888196831c046d9d9848e7ff05b925
