[Python-Dev] Re: Request to postpone some Python 3.9 incompatible changes to Python 3.10

On 01/31/2020 10:47 AM, 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?

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. -- ~Ethan~