Installation error with Python 3.9

[abey79]

These issues must be resolved to be compatible with Python 3.9:

• bezier dependency has no binaries for 3.9
  • replace with https://github.com/torresjrjr/Bezier.py?

---

Edit: the current work-around is the following (in a virtual env of course):

1) Manually install bezier:

This step is no longer required, new bezier binaries have been uploaded: dhermes/bezier#245

2) Install from the fix-python39 branch:

pip install git+https://github.com/abey79/vsketch@fix-python39#egg=vsketch

See @f4nu comment below for another possible issue and fix on macOS Big Sur.

[f4nu]

For bezier we tried installing it with BEZIER_NO_EXTENSION=true pip install bezier and it worked

(vpype_venv) bash-5.0$ BEZIER_NO_EXTENSION=true pip install bezier
Collecting bezier
  Using cached bezier-2020.5.19.tar.gz (313 kB)
Requirement already satisfied: numpy>=1.18.1 in ./vpype_venv/lib/python3.9/site-packages (from bezier) (1.19.5)
Using legacy 'setup.py install' for bezier, since package 'wheel' is not installed.
Installing collected packages: bezier
    Running setup.py install for bezier ... done
Successfully installed bezier-2020.5.19

Furthermore, for macOS, after trying to install vsketch again from the python39-fix branch (on my system at least) it started complaining about the installation of noise:

    Running setup.py install for noise ... error
    ERROR: Command errored out with exit status 1:
     command: /Users/fanu/git/p5js/vpype_venv/bin/python3.9 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/b5/qt72rpsn267_j55zy1xc8h380000gn/T/pip-install-ftxu94bd/noise_a5f5e728354f4b9ca33c34d059444636/setup.py'"'"'; __file__='"'"'/private/var/folders/b5/qt72rpsn267_j55zy1xc8h380000gn/T/pip-install-ftxu94bd/noise_a5f5e728354f4b9ca33c34d059444636/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/b5/qt72rpsn267_j55zy1xc8h380000gn/T/pip-record-8pbapavv/install-record.txt --single-version-externally-managed --compile --install-headers /Users/fanu/git/p5js/vpype_venv/include/site/python3.9/noise
         cwd: /private/var/folders/b5/qt72rpsn267_j55zy1xc8h380000gn/T/pip-install-ftxu94bd/noise_a5f5e728354f4b9ca33c34d059444636/
    Complete output (17 lines):
    running install
    running build
    running build_py
    creating build
    creating build/lib.macosx-11.0-x86_64-3.9
    creating build/lib.macosx-11.0-x86_64-3.9/noise
    copying shader.py -> build/lib.macosx-11.0-x86_64-3.9/noise
    copying perlin.py -> build/lib.macosx-11.0-x86_64-3.9/noise
    copying shader_noise.py -> build/lib.macosx-11.0-x86_64-3.9/noise
    copying __init__.py -> build/lib.macosx-11.0-x86_64-3.9/noise
    copying test.py -> build/lib.macosx-11.0-x86_64-3.9/noise
    running build_ext
    building 'noise._simplex' extension
    creating build/temp.macosx-11.0-x86_64-3.9
    /usr/bin/clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -pipe -Os -I/Users/fanu/git/p5js/vpype_venv/include -I/opt/local/Library/Frameworks/Python.framework/Versions/3.9/include/python3.9 -c _simplex.c -o build/temp.macosx-11.0-x86_64-3.9/_simplex.o -funroll-loops
    clang: error: invalid version number in 'MACOSX_DEPLOYMENT_TARGET=11.0'
    error: command '/usr/bin/clang' failed with exit code 1
    ----------------------------------------
ERROR: Command errored out with exit status 1: /Users/fanu/git/p5js/vpype_venv/bin/python3.9 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/b5/qt72rpsn267_j55zy1xc8h380000gn/T/pip-install-ftxu94bd/noise_a5f5e728354f4b9ca33c34d059444636/setup.py'"'"'; __file__='"'"'/private/var/folders/b5/qt72rpsn267_j55zy1xc8h380000gn/T/pip-install-ftxu94bd/noise_a5f5e728354f4b9ca33c34d059444636/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/b5/qt72rpsn267_j55zy1xc8h380000gn/T/pip-record-8pbapavv/install-record.txt --single-version-externally-managed --compile --install-headers /Users/fanu/git/p5js/vpype_venv/include/site/python3.9/noise Check the logs for full command output.
(vpype_venv) bash-5.0$ clang --version
Apple clang version 11.0.3 (clang-1103.0.32.62)
Target: x86_64-apple-darwin20.3.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

This seems to be an issue with an unsupported version of clang that comes from the Apple Store, a simple purge and reinstall from the command line fixed it:

(vpype_venv) bash-5.0$ sudo rm -rf /Library/Developer/CommandLineTools
(vpype_venv) bash-5.0$ sudo xcode-select --install
xcode-select: note: install requested for command line developer tools
(vpype_venv) bash-5.0$ clang --version
Apple clang version 12.0.0 (clang-1200.0.32.29)
Target: x86_64-apple-darwin20.3.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
(vpype_venv) bash-5.0$ pip install noise
Collecting noise
  Using cached noise-1.2.2.zip (132 kB)
Using legacy 'setup.py install' for noise, since package 'wheel' is not installed.
Installing collected packages: noise
    Running setup.py install for noise ... done
Successfully installed noise-1.2.2

After this, vsketch worked fine.