[jira] [Updated] (CASSANDRA-4090) cqlsh can't handle python being a python3

["Andrew Ash (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-4090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Ash updated CASSANDRA-4090:
----------------------------------

    Attachment: python3-fix.patch
    
> 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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