Python3 Compatibility

首先检查 feedparser.py、compat_logging、htmltmpl 和 planet 代码中确定的兼容性问题，然后将其与包含测试的后续主项目版本进行比较。该 issue 没有定义具体的迁移范围或验收标准，因此在确定完成工作的含义之前，先确认项目方向和受支持的 Python 版本。

REPORT A BUG/PROBLEM

Hi, I want to notify you of a bug/problem that is happening on the Planet.

I am using:
O.S: N/A
Browser: N/A
Platform: N/A

Problem

Python 2 is going away. This code is not compatible with Python3.

Details

This is more of a request for information than a bug. What is the path forward with this code as Python2 goes away? Is there any interest in moving this to 2.7 with compatibility for 3.4+?

Is it worthwhile to migrate this fork of planet over to python3 or is a new platform in the wings to replace this one?

Upon glancing at different parts of this code:
feedparser.py:
I know that feedparser has been maintained and has 10+ years of development over the one included in this repo. It also has python3 support

compat_logging:
Is there any reason the built-in logging won't work?

htmltmpl:
some work has been done in a github fork of the sourceforge repo

planet:
Main project looks dead. Has been rewritten in a number of different languages. The version included seems to have very little code commited to it. There is a later version in the main projects repo that includes TESTS. Perhaps rebase on that?

I would be happy to take some of this on if there is some willingness to accept pull requests. Any thoughts?

Thanks.