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Python: Difference between revisions
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===Python version supported=== <!--T:88--> | ===Python version supported=== <!--T:88--> | ||
In general in the Python ecosystem, the transition to more modern versions of python is accelerating, with many packages only supporting the latest few versions of Python 3.x. In our case, we provide | In general in the Python ecosystem, the transition to more modern versions of python is accelerating, with many packages only supporting the latest few versions of Python 3.x. In our case, we provide prebuilt Python packages in our [[Available Python wheels|wheelhouse]] only for the 3 most recent Python versions available on the systems. This will result in dependencies issues when trying to install those packages with older versions of Python. See [[Python#Package_.27X.27_requires_a_different_Python:_X.Y.Z_not_in_.27.3E.3DX.Y.27|Troubleshooting]]. | ||
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The <code>pip</code> command can install packages from a variety of sources, including PyPI and | The <code>pip</code> command can install packages from a variety of sources, including PyPI and prebuilt distribution packages called Python [https://pythonwheels.com/ wheels]. We provide Python wheels for a number of packages. In the above example, the [https://pip.pypa.io/en/stable/reference/pip_wheel/#cmdoption-no-index <code>--no-index</code>] option tells <code>pip</code> to ''not'' install from PyPI, but instead to install only from locally-available packages, i.e. our wheels. | ||
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If you omit the <code>--no-index</code> option, <code>pip</code> will search both PyPI and local packages, and use the latest version available. If PyPI has a newer version, it will be installed instead of our wheel, possibly causing issues. If you are certain that you prefer to download a package from PyPI rather than use a wheel, you can use the <code>--no-binary</code> option, which tells <code>pip</code> to ignore | If you omit the <code>--no-index</code> option, <code>pip</code> will search both PyPI and local packages, and use the latest version available. If PyPI has a newer version, it will be installed instead of our wheel, possibly causing issues. If you are certain that you prefer to download a package from PyPI rather than use a wheel, you can use the <code>--no-binary</code> option, which tells <code>pip</code> to ignore prebuilt packages entirely. Note that this will also ignore wheels that are distributed through PyPI, and will always compile the package from source. | ||
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By default, it will: | By default, it will: | ||
* only show you the '''latest version''' of a specific package (unless versions are given); | * only show you the '''latest version''' of a specific package (unless versions are given); | ||
* only show you versions that are compatible with the python module (if one loaded) or virtual environment (if activated), otherwise all | * only show you versions that are compatible with the python module (if one loaded) or virtual environment (if activated), otherwise all versions will be shown; | ||
* only show you versions that are compatible with the CPU architecture that you are currently running on. | * only show you versions that are compatible with the CPU architecture that you are currently running on. | ||
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numpy 1.22.2 cp39 generic | numpy 1.22.2 cp39 generic | ||
}} | }} | ||
The <i>python</i> column tell us for which | The <i>python</i> column tell us for which version the wheel is available, where <code>cp39</code> stands for <code>cpython 3.9</code>. | ||
==== Requirements file ==== <!--T:81--> | ==== Requirements file ==== <!--T:81--> | ||
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The current python module loaded (3.6.10 in this case) is not supported by that package. You can update to a more recent | The current python module loaded (3.6.10 in this case) is not supported by that package. You can update to a more recent version, such as the latest available module. Or install an older version of package 'X'. | ||
=== Package has requirement X, but you'll have Y which is incompatible === <!--T:84--> | === Package has requirement X, but you'll have Y which is incompatible === <!--T:84--> | ||
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Two common cases are: | Two common cases are: | ||
* trying to install a <code>manylinux</code> package | * trying to install a <code>manylinux</code> package | ||
* or a python package built for a different | * or a python package built for a different Python version (e.g. installing a package built for python 3.11 when you have python 3.9). | ||
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