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python docs: update block according to code review
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@ -812,36 +812,48 @@ and install python modules through `pip` the traditional way.
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Create this `default.nix` file, together with a `requirements.txt` and simply execute `nix-shell`.
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```
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th import <nixpkgs> {};
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with import <nixpkgs> {};
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with pkgs.python27Packages;
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buildPythonPackage {
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stdenv.mkDerivation {
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name = "impurePythonEnv";
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buildInputs = [
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# these packages are required for virtualenv and pip to work:
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#
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python27Full
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python27Packages.virtualenv
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python27Packages.pip
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# the following packages are related to the dependencies of your python
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# project.
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# In this particular example the python modules listed in the
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# requirements.tx require the following packages to be installed locally
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# in order to compile any binary extensions they may require.
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#
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taglib
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openssl
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git
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libxml2
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libxslt
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libzip
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python27Full
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python27Packages.virtualenv
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python27Packages.pip
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stdenv
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zlib ];
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src = null;
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# When used as `nix-shell --pure`
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shellHook = ''
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unset http_proxy
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export GIT_SSL_CAINFO=/etc/ssl/certs/ca-bundle.crt
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virtualenv --no-wheel --no-setuptools venv
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# set SOURCE_DATE_EPOCH so that we can use python wheels
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SOURCE_DATE_EPOCH=$(date +%s)
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virtualenv --no-setuptools venv
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export PATH=$PWD/venv/bin:$PATH
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pip install -r requirements.txt --no-use-wheel
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pip install -r requirements.txt
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'';
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}
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```
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Note that the `pip install` is an imperative action. So every time `nix-shell`
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is executed it will attempt to download the python modules listed in
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requirements.txt. However these will be cached locally within the `virtualenv`
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folder and not downloaded again.
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## Contributing
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### Contributing guidelines
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