[GitHub] [spark] HyukjinKwon commented on a change in pull request #25289: [SPARK-27889] [Build] [Deploy] Make development scripts under dev/ support Python 3

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HyukjinKwon commented on a change in pull request #25289: [SPARK-27889] [Build] [Deploy] Make development scripts under dev/ support Python 3
URL: https://github.com/apache/spark/pull/25289#discussion_r308309746
 
 

 ##########
 File path: python/run-tests.py
 ##########
 @@ -161,8 +161,13 @@ def run_individual_python_test(target_dir, test_name, pyspark_python):
 
 def get_default_python_executables():
     python_execs = [x for x in ["python2.7", "python3.6", "pypy"] if which(x)]
-    if "python2.7" not in python_execs:
-        LOGGER.warning("Not testing against `python2.7` because it could not be found; falling"
+    if ("python3.6" not in python_execs) and which("python3"):
+        LOGGER.warning("Not testing against `python3.6` because it could not be found; falling"
+                       " back to `python3` instead")
+        python_execs.insert(0, "python3")
 
 Review comment:
   It's not neccessary. This script already provides an option to specify python executables. `--python-executables`

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