ImportError during install

[Qrokqt]

I tried to install zarr and it seems like it failed when trying to install numcodecs

(zarrvenv) joe@home:~/zarr$ python3 -m pip install zarr
Collecting zarr
  Downloading https://files.pythonhosted.org/packages/56/a6/817d25f7b77b695b1014030bfff90288846862a50d72c1ee85a8a233c040/zarr-2.12.0-py3-none-any.whl (185kB)
    100% |████████████████████████████████| 194kB 8.6MB/s
Collecting asciitree (from zarr)
  Downloading https://files.pythonhosted.org/packages/2d/6a/885bc91484e1aa8f618f6f0228d76d0e67000b0fdd6090673b777e311913/asciitree-0.3.3.tar.gz
Collecting numpy>=1.7 (from zarr)
  Downloading https://files.pythonhosted.org/packages/45/b7/de7b8e67f2232c26af57c205aaad29fe17754f793404f59c8a730c7a191a/numpy-1.21.6.zip (10.3MB)
    100% |████████████████████████████████| 10.3MB 210kB/s
  Installing build dependencies ... done
Collecting fasteners (from zarr)
  Downloading https://files.pythonhosted.org/packages/61/bf/fd60001b3abc5222d8eaa4a204cd8c0ae78e75adc688f33ce4bf25b7fafa/fasteners-0.19-py3-none-any.whl
Collecting numcodecs>=0.6.4 (from zarr)
  Downloading https://files.pythonhosted.org/packages/91/71/3942cb3cc8de0d702a896435c1d905a000facd55ba58afe33bd19b93f232/numcodecs-0.10.2.tar.gz (4.5MB)
    100% |████████████████████████████████| 4.5MB 447kB/s
    Complete output from command python setup.py egg_info:
    [numcodecs] setting up Blosc extension
    [numcodecs] compiling Blosc extension with SSE2 support
    [numcodecs] compiling Blosc extension with AVX2 support
    [numcodecs] setting up Zstandard extension
    [numcodecs] setting up LZ4 extension
    [numcodecs] setting up compat extension
    [numcodecs] setting up shuffle extension
    [numcodecs] setting up vlen extension
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-cz69yi5q/numcodecs/setup.py", line 380, in <module>
        run_setup(with_extensions)
      File "/tmp/pip-install-cz69yi5q/numcodecs/setup.py", line 373, in run_setup
        zip_safe=False,
      File "/path/to/venv/lib/python3.7/site-packages/setuptools/__init__.py", line 145, in setup
        return distutils.core.setup(**attrs)
      File "/usr/lib/python3.7/distutils/core.py", line 108, in setup
        _setup_distribution = dist = klass(attrs)
      File "/path/to/venv/lib/python3.7/site-packages/setuptools/dist.py", line 447, in __init__
        k: v for k, v in attrs.items()
      File "/usr/lib/python3.7/distutils/dist.py", line 292, in __init__
        self.finalize_options()
      File "/path/to/venv/lib/python3.7/site-packages/setuptools/dist.py", line 739, in finalize_options
        ep.load()(self, ep.name, value)
      File "/path/to/venv/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2411, in load
        return self.resolve()
      File "/path/to/venv/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2417, in resolve
        module = __import__(self.module_name, fromlist=['__name__'], level=0)
      File "/tmp/pip-install-cz69yi5q/numcodecs/.eggs/setuptools_scm-8.0.4-py3.7.egg/setuptools_scm/__init__.py", line 7, in <module>
        from ._config import Configuration
      File "/tmp/pip-install-cz69yi5q/numcodecs/.eggs/setuptools_scm-8.0.4-py3.7.egg/setuptools_scm/_config.py", line 11, in <module>
        from typing import Protocol
    ImportError: cannot import name 'Protocol' from 'typing' (/usr/lib/python3.7/typing.py)

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-cz69yi5q/numcodecs/

[martindurant]

Py3.7 is pretty old now. You might need to specify an older version of zarr or, better, update to a more recent python (v3.12 is the current one). Even easier might be to use conda, which is better at ensuring consistent sets of package versions for any version of python.