Rufflewind authored Dec 09, 2016 and Ben Gamari committed Dec 09, 2016

The `std*_buffer` need to be bytes to avoid breaking Python 3.

Also, using a blanket `except` in Python without specifying the
exception types will catch special exceptions such as
`KeyboardInterrupt`, which can prevent the program from being
interrupted properly.

Test Plan: validate

Reviewers: thomie, austin, bgamari

Reviewed By: bgamari

Differential Revision: https://phabricator.haskell.org/D2805