pyyaml has been disabled because it does not meet homebrew/core's requirements for Python library formulae!

[stefanottili]

Output of brew config

HOMEBREW_VERSION: 4.4.3
ORIGIN: https://github.com/Homebrew/brew
HEAD: 91f3671b16fe62121364c465c14e0dfd088d7ead
Last commit: 6 days ago
Core tap JSON: 02 Nov 18:17 UTC
Core cask tap JSON: 02 Nov 18:17 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: :0
HOMEBREW_MAKE_JOBS: 8
Homebrew Ruby: 3.3.5 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.3.5/bin/ruby
CPU: octa-core 64-bit arm_firestorm_icestorm
Clang: 16.0.0 build 1600
Git: 2.47.0 => /opt/homebrew/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 15.1-arm64
CLT: 16.1.0.0.1.1729049160
Xcode: N/A
Rosetta 2: false

Output of brew doctor

Warning: Some installed kegs have no formulae!
This means they were either deleted or installed manually.
You should find replacements for the following formulae:
  cudd
  swig@3

Warning: Some installed formulae are deprecated or disabled.
You should find replacements for the following formulae:
  swig@3

Description of issue

https://theopenroadproject.org uses yaml and this worked til recently.
How do I get this to work again ?

Traceback (most recent call last):
  File "OpenROAD-flow-scripts/flow/scripts/defaults.py", line 4, in <module>
    import yaml
ModuleNotFoundError: No module named 'yaml'

brew install pyyaml
==> Downloading https://formulae.brew.sh/api/formula.jws.json
########################################################################################################################################################################### 100.0%
==> Downloading https://formulae.brew.sh/api/cask.jws.json
########################################################################################################################################################################### 100.0%
Error: pyyaml has been disabled because it does not meet homebrew/core's requirements for Python library formulae! It was disabled on 2024-10-06.

[iMichka]

Yes. You should use pip3 install for that package. We do not provide it anymore. There was no added value for homebrew to ship it when it can be early be installed though pip.

[stefanottili]

I'm sorry, I'm a complete python newbie, pyyaml was installed using the OpenRoad DependencyInstaller.sh

Using pip3 install gives me "error: externally-managed-environment".
Any hint on how to proceed ?

pip3 install pyyaml

[notice] A new release of pip is available: 24.2 -> 24.3.1
[notice] To update, run: python3.13 -m pip install --upgrade pip
error: externally-managed-environment

× This environment is externally managed
╰─> To install Python packages system-wide, try brew install
    xyz, where xyz is the package you are trying to
    install.
...
python3.13 -m pip install --upgrade pip

[notice] A new release of pip is available: 24.2 -> 24.3.1
[notice] To update, run: python3.13 -m pip install --upgrade pip
error: externally-managed-environment

× This environment is externally managed
╰─> To install Python packages system-wide, try brew install
    xyz, where xyz is the package you are trying to
    install.
...

[stefanottili]

pip3 -V
pip 24.2 from /opt/homebrew/lib/python3.13/site-packages/pip (python 3.13)

[stefanottili]

It seems that all the sudden, just using brew is not enough any more.
Now I have to wrap my head around "virtual env". Ok, grr ..

https://discuss.python.org/t/on-macos-14-pip-install-throws-error-externally-managed-environment/50352/5

[iMichka]

Yes we introduced mandatory virtual envs lately, because a lot of people try to install various versions of libraries and mixing stuff, and sometimes breaking their env. Virtual envs allow a clear separation between different envs and gives better control of what you are doing.

It's a little bit harder to setup the first time, but it's really better in the long run.