Python 3.8 instead of Python 3.7

[eirnym]

It's time to move on to python 3.8. It was released half a year ago and vim core supports it. Most libraries which had supported python 3.7 also have support for python 3.8

[ychin]

Homebrew is still at 3.7.6: https://formulae.brew.sh/formula/python

There are some discussions here (https://discourse.brew.sh/t/why-python-3-8-has-not-been-updated-yet/6057/16) and there is a ticket (Homebrew/homebrew-core#47274) tracking this migration.

Given that Homebrew hasn't switched over I prefer to not upgrade until they do it. Part of the reason is that it complicates our CI build scripts and also I think we should assume most users install the default python package instead of the explicit python@3.8.

[eirnym]

I still don't agree with an idea "all ports should use one true python/java/(any other tool)". I'm asking about only Github version.

My personal opinion, that if Homebrew wants to stay behind using following ideology of "one true ..", they can patch vimrc and other defaults as they pleased.

[eirnym]

I understand, that my proposition is not very nice, but Homebrew as any other package manager has much greater mobility to change params, code, and other things than users who use releases from Github like me.

Unfortunately, simply specifying python3.8 in a library path doesn't work well for me.

[eirnym]

@ychin BTW, Your response sounds like "you use Homebrew/MacPorts to use MacVim with Python3.8 (and more likely 3.7) or build and maintain it manually".

[ychin]

So can you be more specific what supporting "Python 3.8" means?

Are you talking about how we automatically set pythonthreedll to be 3.7? Can't you just set that variable to the correct path yourself. The auto-detection is really a clutch because there's no way for Vim to be able to find all possible Python versions for you.

Or did you mean something else?

[eirnym]

I can't just change pythonthreedll as ABI is not compatible between python versions (third number is compatible while second may be not). PEP-606 to provide backward binary compatibility was rejected.

So I need MacVim to be compiled with python3.8 and I'd like to update official vimrc from 3.7 to 3.8, that's it.

As I've said, Homebrew, Macports and any other port system may stay with compatibility ranges of MacVim by using little patch to vimrc and by provide an appropriate argument to configure script. Alternatively to make manual patches, configure/make script itself may patch vimrc,

[eirnym]

They already changed the python to 3.8 across the Homebrew.

[eirnym]

Nevertheless, I ask you for making official builds with 2-3 major python releases when it's possible. Other languages doesn't change so much as Python nowadays. This will give an opportunity to use an official build and use Python version they want.

For Homebrew only one build will not require an additional dependency installation, so price is small.

[luca-drf]

Homebrew migration to Python 3.8 is complete: Homebrew/homebrew-core#47274 (comment)
Latest MacVim snapshot 163 which is installed by hombrew-cask seems to be pointing to Python 3.7

[itsayellow]

:python3 in my homebrew cask installed macvim is no longer operational because it doesn't find python3.7

E370: Could not load library /usr/local/Frameworks/Python.framework/Versions/3.7/Python
E263: Sorry, this command is disabled, the Python library could not be loaded.

[itsayellow]

When using homebrew's python, maybe in the future MacVim can default to the 'Current' subdirectory instead of a hard-coded version-numbered subdirectory, like:

set pythonthreedll=/usr/local/Frameworks/Python.framework/Versions/Current/Python

[eirnym]

When using homebrew's python, maybe in the future MacVim can default to the 'Current' subdirectory instead of a hard-coded version-numbered subdirectory, like:

set pythonthreedll=/usr/local/Frameworks/Python.framework/Versions/Current/Python

No, it's impossible to do as I wrote above Python resigned from PEP-606 to support backward binary compatibility. So you'll have problems with Python 3.7 used in MacVim & Python 3.8/3.9 etc.

[eirnym]

:python3 in my homebrew cask installed macvim is no longer operational because it doesn't find python3.7

E370: Could not load library /usr/local/Frameworks/Python.framework/Versions/3.7/Python
E263: Sorry, this command is disabled, the Python library could not be loaded.

this is one of problems I want to avoid