Skip Python 2 versions when locating Python #3476
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Summary
Unfortunately, the
-Iflag was added in Python 3.4. So if we query a Python version prior to 3.4 (e.g., Python 2.7), we can't run our script at all, and lose the ability to match against our structured error.This PR adds an additional check against the stderr output for these cases.
Closes #3474.
Test Plan
Installed Python 2.7, and verified that it was skipped (and that we instead found my
python3).