cqlsh can't handle python being a python3
-----------------------------------------
Key: CASSANDRA-4090
URL: https://issues.apache.org/jira/browse/CASSANDRA-4090
Project: Cassandra
Issue Type: Bug
Affects Versions: 1.0.8
Environment: On Archlinux, where Python3 installations are default
(most distros currently use Python2 as default now)
{code}
$ ls -l `which python`
lrwxrwxrwx 1 root root 7 Nov 21 09:05 /usr/bin/python -> python3
{code}
Reporter: Andrew Ash
Attachments: python3-fix.patch
cqlsh fails to run when {{python}} is a Python 3, with this error message:
{code}
andrew@spite:~/src/cassandra-trunk/bin $ ./cqlsh
File "./cqlsh", line 97
except ImportError, e:
^
SyntaxError: invalid syntax
andrew@spite:~/src/cassandra-trunk/bin $
{code}
The error occurs because the cqlsh script checks for a default installation of
python that is older than a certain version, but not one newer that is
incompatible (e.g. Python3). To fix this, I update the logic to only run
{{python}} if it's a version at least 2.5 but before 3.0 If this version of
python is in that range then role with it, otherwise try python2.6, python2.7,
then python2.5 (no change from before).
This is working on my installation, where {{python}} executes python 3.2.2 and
doesn't break backwards compatibility to distributions that haven't made the
jump to Python3 as default yet.
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