Brew install/upgrade dvc overwrites current version of python3

[philipperemy]

I'm running on MacOS with python3.7.

When running brew install dvc or even brew upgrade dvc, my python was changed to python3.8 and it broke all my other virtual environments.

Not really a bug here but should be more careful about brew and forcing a python version.

Python has been installed as
  /usr/local/bin/python3

Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
  /usr/local/opt/python@3.8/libexec/bin

You can install Python packages with
  pip3 install <package>
They will install into the site-package directory
  /usr/local/lib/python3.8/site-packages

See: https://docs.brew.sh/Homebrew-and-Python

Python has been installed as
  /usr/local/bin/python3

Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
  /usr/local/opt/python@3.8/libexec/bin

You can install Python packages with
  pip3 install <package>
They will install into the site-package directory
  /usr/local/lib/python3.8/site-packages

[philipperemy]

So please if you are suggesting for upgrade, do not force the update of python3! :)

[efiop]

@philipperemy IIRC homebrew guys updated it to 3.8 for us: Homebrew/homebrew-core@bc452dc because they are migrating to 3.8 by default. Looking through the formulas, all of them depend on 3.8, so this is a homebrew policy that we can't really do much about 🙁 If you need very specific python version, I would suggest using something like pyenv. python brew package will be upgraded along with any package that depends on it, not only dvc.

[philipperemy]

Oh I see then nothing to do... Just to keep in mind!

[pmrowla]

For future reference, this is because homebrew changed their default python version from 3.7 to 3.8 last week (and is unrelated to the DVC brew package)
Homebrew/homebrew-core#54912