On 2020-01-31 19:47, Mike Miller wrote:
On 2020-01-23 07:20, Victor Stinner wrote:
> Python 3.9 introduces many small incompatible changes which broke tons
There's a well-known and established way of signaling breaking changes
in software platforms—it is to increment the major version number.
Rather than debating the merits of breaking code on 3.9 or 3.10,
wouldn't it make more sense to do it in a Python 4.0 instead? Well,
either of these strategies sound logical to me:
- Python 4.0 with removal of all of the Python 3-era deprecations
- Continuing Python 3.1X with no breaks
In other words, we should keep compatibility, or not. In any case, from
the looks of it these will be tiny breaks compared to the Unicode
transition.
The Unicode transition also looked very small back when 3.0 was planned.
It only takes one such not-so-little thing to make a big breaking
release like 3.0. And even if all the changes were little, I wouldn't
want to inflict 10 years of papercuts at once.
When the changes are rolled out gradually across minor releases, those
that cause unforeseen trouble in real-world code can be identified in
the alphas/betas, and rethought/reverted if necessary.
Ethan Furman wrote:
I've gotta say, I like that plan. Instead of going to x.10, go to x+1.0. Every ten years we bump the major version and get rid of all the deprecations.
I don't. I hope the 10-year (and counting) transition from Python 2 to
Python 3 will not become a tradition.
I'd rather iterate on making removals less drastic (e.g. by making the
DeprecationWarnings more visible). Iterate with a feedback loop, rather
than do a one-time change and hope that everything goes well.
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