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Python: explain deterministic build in docs

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Frederik Rietdijk 2017-02-22 15:55:58 +01:00
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doc/languages-frameworks/python.md
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@ -641,6 +641,19 @@ community to help save time. No tool is preferred at the moment.
- [pypi2nix](https://github.com/garbas/pypi2nix) by Rok Garbas
- [pypi2nix](https://github.com/offlinehacker/pypi2nix) by Jaka Hudoklin
### Deterministic builds
Python 2.7, 3.5 and 3.6 are now built deterministically and 3.4 mostly.
Minor modifications had to be made to the interpreters in order to generate
deterministic bytecode. This has security implications and is relevant for
those using Python in a `nix-shell`.
When the environment variable `DETERMINISTIC_BUILD` is set, all bytecode will have timestamp 1.
The `buildPythonPackage` function sets `DETERMINISTIC_BUILD` as well as
[PYTHONHASHSEED](https://docs.python.org/3.5/using/cmdline.html#envvar-PYTHONHASHSEED).
Both are also exported in `nix-shell`.
## FAQ
### How can I install a working Python environment?