mesos git commit: Changed python3 support check script to print to `stderr`.

[bb...@apache.org]

Repository: mesos
Updated Branches:
  refs/heads/master a83a25203 -> 30e7429c8


Changed python3 support check script to print to `stderr`.

The scripts this might be used in might use `stdout` to report
results we do not intend to interfere with, e.g.,
`support/apply-reviews.py` can print commands to execute in dry run
mode.

This patch makes the check script print to `stderr` instead of
`stdout`.

Review: https://reviews.apache.org/r/67348/


Project: http://git-wip-us.apache.org/repos/asf/mesos/repo
Commit: http://git-wip-us.apache.org/repos/asf/mesos/commit/30e7429c
Tree: http://git-wip-us.apache.org/repos/asf/mesos/tree/30e7429c
Diff: http://git-wip-us.apache.org/repos/asf/mesos/diff/30e7429c

Branch: refs/heads/master
Commit: 30e7429c85f743384f83454eb29b14fe3efe3c39
Parents: a83a252
Author: Benjamin Bannier <be...@mesosphere.io>
Authored: Tue May 29 10:16:13 2018 +0200
Committer: Benjamin Bannier <bb...@apache.org>
Committed: Tue May 29 10:16:13 2018 +0200

----------------------------------------------------------------------
 support/check-python3.py | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/mesos/blob/30e7429c/support/check-python3.py
----------------------------------------------------------------------
diff --git a/support/check-python3.py b/support/check-python3.py
index 08252d8..898e543 100644
--- a/support/check-python3.py
+++ b/support/check-python3.py
@@ -20,24 +20,28 @@ Checks if Python 3.6 is available on the machine.
 """
 # pylint: disable=superfluous-parens
 
+from __future__ import print_function
+
 import os
 import subprocess
 import sys
 
+def _print(message):
+  print(message, file=sys.stderr)
 
 def print_error():
     """Prints a warning requesting to install Python 3.6."""
-    print("The support scripts will be upgraded to Python 3 by July 1st.")
-    print("Make sure to install Python 3.6 on your machine before.")
+    _print("The support scripts will be upgraded to Python 3 by July 1st.")
+    _print("Make sure to install Python 3.6 on your machine before.")
 
 def print_warning():
     """Prints a warning requesting to use the Python 3 scripts."""
-    print("Congratulations! You have Python 3 installed correctly.")
-    print("Please start using the scripts in `support/python3`.")
+    _print("Congratulations! You have Python 3 installed correctly.")
+    _print("Please start using the scripts in `support/python3`.")
     # NOTE: This is only either unset, or set to 3.
     if "MESOS_SUPPORT_PYTHON" not in os.environ:
-        print("Please also set the environment variable `MESOS_SUPPORT_PYTHON` to `3`")
-        print("so that the Git hooks use the Python 3 scripts.")
+        _print("Please also set the environment variable `MESOS_SUPPORT_PYTHON` to `3`")
+        _print("so that the Git hooks use the Python 3 scripts.")
 
 if sys.version_info[0] < 3:
     # On Windows, system-wide installations of Python 3.6 gives a tools called