Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19524#discussion_r145593044
--- Diff: dev/run-tests ---
@@ -20,4 +20,10 @@
FWDIR="$(cd "`dirname $0`"/..; pwd)"
cd "$FWDIR"
+PYTHON_VERSION_CHECK=$(python -c 'import sys; print(sys.version_info < (2,
7, 0))')
--- End diff --
@holdenk and @shaneknapp, looks I can't just check this within Python
scripts.
As we know from the previous issue, `dev/run-tests.py` is not compatible
with Python 2.6.x due to dictionary comprehension syntax:
```
python2.6 dev/run-tests.py
```
```
File "dev/run-tests.py", line 128
{m: set(m.dependencies).intersection(modules_to_test) for m in
modules_to_test}, sort=True)
^
SyntaxError: invalid syntax
```
I tried to change this as below:
```
git diff dev/run-tests.py
```
```diff
diff --git a/dev/run-tests.py b/dev/run-tests.py
index 72d148d7ea0..dcec912ae23 100755
--- a/dev/run-tests.py
+++ b/dev/run-tests.py
@@ -27,6 +27,10 @@ import sys
import subprocess
from collections import namedtuple
+if sys.version_info < (2, 7):
+ print("[error] Python versions prior to 2.7 are not supported.")
+ sys.exit(-1)
+
from sparktestsupport import SPARK_HOME, USER_HOME, ERROR_CODES
from sparktestsupport.shellutils import exit_from_command_with_retcode,
run_cmd, rm_r, which
from sparktestsupport.toposort import toposort_flatten, toposort
```
but it still gives syntax error ahead:
```
python2.6 dev/run-tests.py
```
```
File "dev/run-tests.py", line 128
{m: set(m.dependencies).intersection(modules_to_test) for m in
modules_to_test}, sort=True)
^
SyntaxError: invalid syntax
```
I think we should not force to workaround for Python 2.6 syntax error as it
was dropped. So, I just tried to fix both `dev/run-tests` and
`dev/run-tests-jenkins` as proposed currently.
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