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python3Packages.mkPythonMetaPackage: init

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This function exists create a meta package containing [metadata files](https://packaging.python.org/en/latest/specifications/recording-installed-packages/) to satisfy a dependency on a package, without it actually having been installed into the environment.
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adisbladis
2024-08-29 20:38:30 +12:00
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doc/languages-frameworks/python.section.md
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@@ -361,6 +361,19 @@ modifications.
Do pay attention to passing in the right Python version!
#### `mkPythonMetaPackage` function {#mkpythonmetapackage-function}
This will create a meta package containing [metadata files](https://packaging.python.org/en/latest/specifications/recording-installed-packages/) to satisfy a dependency on a package, without it actually having been installed into the environment.
In nixpkgs this is used to package Python packages with split binary/source distributions such as [psycopg2](https://pypi.org/project/psycopg2/)/[psycopg2-binary](https://pypi.org/project/psycopg2-binary/).
```nix
mkPythonMetaPackage {
pname = "pscycopg2-binary";
inherit (psycopg2) optional-dependencies version meta;
dependencies = [ psycopg2 ];
}
```
#### `python.buildEnv` function {#python.buildenv-function}
Python environments can be created using the low-level `pkgs.buildEnv` function.