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Hotfix Python 2 regression from #7366 using FileNotFoundError (#7381)

### Problem
The function `python_interpreter_path()` from `` was originally failing to execute on Py3 because it would encounter `FileNotFoundError`, which we weren't catching, so we added this to the except statement in #7366.

However, the exception apparently does not exist in Python 2, so the nightly cron job failed:

### Solution
Alias the error `if PY2`. We use this idiom, rather than a try except, so that we can easily automatically delete this code once we drop Py2.

### Result
`PY=python2.7 ./build-support/bin/` now works again.
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Eric-Arellano committed Mar 14, 2019
1 parent a88855c commit 552f6643d4cf36e5bf9ea96eee26127033b842f1
@@ -72,6 +72,7 @@ python_library(
@@ -7,6 +7,8 @@
import os
from unittest import skipIf

from future.utils import PY3

from pants.util.process_handler import subprocess

@@ -50,7 +52,7 @@ def python_interpreter_path(version):
command = ['python{}'.format(version), '-c', 'import sys; print(sys.executable)']
py_path = subprocess.check_output(command).decode('utf-8').strip()
return os.path.realpath(py_path)
except (subprocess.CalledProcessError, FileNotFoundError):
except (subprocess.CalledProcessError, FileNotFoundError if PY3 else IOError):
return None

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