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Several pip fixes for Python hydration #186

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Several pip fixes for Python hydration #186

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Commits on Jan 10, 2024

  1. Invoke pip using python3 -m pip rather than pip3 

    This is closer to the recommended way to invoke pip according to the
[latest pip documentation](https://pip.pypa.io/en/stable/getting-started/).

The reason why this invocation is more robust is that it only
requires the Python interpreter itself to be on the PATH, and it is
robust to the bin directory corresponding to site-packages being
omitted from the PATH (usually by accident).
    @lpsinger
    lpsinger committed Jan 10, 2024
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  2. Use pip --version, not pip list, to test for working pip 

    `pip list` can be very time consuming if there are many packages
installed. `pip --version` is fast regardless.
    @lpsinger
    lpsinger committed Jan 10, 2024
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  3. Permit installing Python packages from source if host and target match 

    Some Python packages _must_ be installed from source: either PyPI
only holds source distributions of them, or lacks wheels for the
target platform. If the host platform matches the target Lambda
platform, then permit installation of Python packages from source.
    @lpsinger
    lpsinger committed Jan 10, 2024
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