如何將 Python 2 的程式碼移植到 Python 3
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作者:
   Brett Cannon

Python 2 reached its official end-of-life at the start of 2020. This
means that no new bug reports, fixes, or changes will be made to
Python 2 - it's no longer supported: see **PEP 373** and status of
Python versions.

If you are looking to port an extension module instead of pure Python
code, please see 遷移延伸模組到 Python 3.

The archived python-porting mailing list may contain some useful
guidance.

Since Python 3.11 the original porting guide was discontinued. You can
find the old guide in the archive.


Third-party guides
==================

There are also multiple third-party guides that might be useful:

* Guide by Fedora

* PyCon 2020 tutorial

* Guide by DigitalOcean

* Guide by ActiveState
