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Diffstat (limited to 'doc/languages-frameworks/python.section.md')
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1 files changed, 24 insertions, 6 deletions
diff --git a/doc/languages-frameworks/python.section.md b/doc/languages-frameworks/python.section.md index 26458c3906e..c0f1342a94f 100644 --- a/doc/languages-frameworks/python.section.md +++ b/doc/languages-frameworks/python.section.md @@ -7,8 +7,9 @@ #### Overview Several versions of the Python interpreter are available on Nix, as well as a -high amount of packages. The attribute `python` refers to the default -interpreter, which is currently CPython 2.7. It is also possible to refer to +high amount of packages. The attribute `python3` refers to the default +interpreter, which is currently CPython 3.8. The attribute `python` refers to +CPython 2.7 for backwards-compatibility. It is also possible to refer to specific versions, e.g. `python38` refers to CPython 3.8, and `pypy` refers to the default PyPy interpreter. @@ -762,10 +763,10 @@ and in this case the `python38` interpreter is automatically used. Versions 2.7, 3.6, 3.7, 3.8 and 3.9 of the CPython interpreter are available as respectively `python27`, `python36`, `python37`, `python38` and `python39`. The aliases `python2` and `python3` correspond to respectively `python27` and -`python38`. The default interpreter, `python`, maps to `python2`. The PyPy -interpreters compatible with Python 2.7 and 3 are available as `pypy27` and -`pypy3`, with aliases `pypy2` mapping to `pypy27` and `pypy` mapping to `pypy2`. -The Nix expressions for the interpreters can be found in +`python39`. The attribute `python` maps to `python2`. The PyPy interpreters +compatible with Python 2.7 and 3 are available as `pypy27` and `pypy3`, with +aliases `pypy2` mapping to `pypy27` and `pypy` mapping to `pypy2`. The Nix +expressions for the interpreters can be found in `pkgs/development/interpreters/python`. All packages depending on any Python interpreter get appended @@ -788,6 +789,23 @@ Each interpreter has the following attributes: - `executable`. Name of the interpreter executable, e.g. `python3.8`. - `pkgs`. Set of Python packages for that specific interpreter. The package set can be modified by overriding the interpreter and passing `packageOverrides`. +### Optimizations + +The Python interpreters are by default not build with optimizations enabled, because +the builds are in that case not reproducible. To enable optimizations, override the +interpreter of interest, e.g using + +``` +let + pkgs = import ./. {}; + mypython = pkgs.python3.override { + enableOptimizations = true; + reproducibleBuild = false; + self = mypython; + }; +in mypython +``` + ### Building packages and applications Python libraries and applications that use `setuptools` or |