nixpkgs/pkgs/development/interpreters/python/setup-hook.sh

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addPythonPath() {
addToSearchPathWithCustomDelimiter : PYTHONPATH $1/@sitePackages@
}
toPythonPath() {
local paths="$1"
local result=
for i in $paths; do
p="$i/@sitePackages@"
result="${result}${result:+:}$p"
done
echo $result
}
if [ -z "${dontAddPythonPath:-}" ]; then
addEnvHooks "$hostOffset" addPythonPath
fi
# Determinism: The interpreter is patched to write null timestamps when compiling python files.
# This way python doesn't try to update them when we freeze timestamps in nix store.
export DETERMINISTIC_BUILD=1;
# Determinism: We fix the hashes of str, bytes and datetime objects.
export PYTHONHASHSEED=0;
# Determinism. Whenever Python is included, it should not check user site-packages.
# This option is only relevant when the sandbox is disabled.
export PYTHONNOUSERSITE=1;