Define unicode in Python 3

[cclauss]

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[iredmail]

Dear @cclauss,

I will drop py2 support in this project and use py3 only. So no need to send PR for py2 compatibility.
Thank you very much for the contribution. :)

[cclauss]

Here is the trick. It is better to have a single codebase that supports both Python 2 and Python 3 -- even if it only exists for a little while. It helps a lot to be able to do A/B testing. Being able to run the A client against the B server and vice versa can aid in finding bytes vs. strings incompatibilities. Enabling rollbackable transitions has proven to be useful on many Py2 to Py3 transitions. Being able to measure performance on A/B can be useful as well.

In this codebase, you only have one single redefine. I would encourage you to accept it because there is proven value in A/B testing on a single codebase and when you shift to Python 3 only, this change is isolated to a single file. Your choice of course but that is my advise after having done many Python 2 to Python 3 conversions.

[iredmail]

Thanks for sharing.

• This is a small py program, mostly do file read/write/update and few SQL/LDAP queries/updates.
• I will update file tools/upgrade_mlmmjadmin.sh to install py3 and required py modules during upgrade on different Linux/BSD distributions.
• Performance is not a concern at all since no heavy access to this program.

So, no need to take care of py2 support and let's just switch to py3-only completely.