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doc: cleanup whitespace in python.md

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Alexey Muranov 2017-03-05 01:00:02 +01:00 committed by Jörg Thalheim
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doc/languages-frameworks/python.md
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@ -576,7 +576,7 @@ specified packages in its path.
#### python.withPackages function
The `python.withPackages` function provides a simpler interface to the `python.buildEnv` functionality.
It takes a function as an argument that is passed the set of python packages and returns the list
It takes a function as an argument that is passed the set of python packages and returns the list
of the packages to be included in the environment. Using the `withPackages` function, the previous
example for the Pyramid Web Framework environment can be written like this:
@ -584,10 +584,10 @@ example for the Pyramid Web Framework environment can be written like this:
python.withPackages (ps: [ps.pyramid])
`withPackages` passes the correct package set for the specific interpreter version as an
`withPackages` passes the correct package set for the specific interpreter version as an
argument to the function. In the above example, `ps` equals `pythonPackages`.
But you can also easily switch to using python3:
with import <nixpkgs> {};
python3.withPackages (ps: [ps.pyramid])
@ -828,7 +828,7 @@ Create this `default.nix` file, together with a `requirements.txt` and simply ex
with import <nixpkgs> {};
with pkgs.python27Packages;
stdenv.mkDerivation {
stdenv.mkDerivation {
name = "impurePythonEnv";
buildInputs = [
# these packages are required for virtualenv and pip to work:
@ -836,10 +836,10 @@ stdenv.mkDerivation {
python27Full
python27Packages.virtualenv
python27Packages.pip
# the following packages are related to the dependencies of your python
# project.
# In this particular example the python modules listed in the
# requirements.tx require the following packages to be installed locally
# the following packages are related to the dependencies of your python
# project.
# In this particular example the python modules listed in the
# requirements.tx require the following packages to be installed locally
# in order to compile any binary extensions they may require.
#
taglib
@ -854,7 +854,7 @@ stdenv.mkDerivation {
shellHook = ''
# set SOURCE_DATE_EPOCH so that we can use python wheels
SOURCE_DATE_EPOCH=$(date +%s)
virtualenv --no-setuptools venv
virtualenv --no-setuptools venv
export PATH=$PWD/venv/bin:$PATH
pip install -r requirements.txt
'';
@ -862,7 +862,7 @@ stdenv.mkDerivation {
```
Note that the `pip install` is an imperative action. So every time `nix-shell`
is executed it will attempt to download the python modules listed in
is executed it will attempt to download the python modules listed in
requirements.txt. However these will be cached locally within the `virtualenv`
folder and not downloaded again.