Add some python packages.

Some gertty dependencies, more to come.

dev-python/alembic/alembic_python3-1.0.0.recipe

@@ -0,0 +1,59 @@
+SUMMARY="Database migration tool for SQLAlchemy"
+DESCRIPTION="A database migrations tool written by the author of SQLAlchemy. \
+It offers the following functionality:
+* Can emit ALTER statements to a database in order to change the structure of \
+tables and other constructs
+* Provides a system whereby “migration scripts” may be constructed; each \
+script indicates a particular series of steps that can “upgrade” a target \
+database to a new version, and optionally a series of steps that can \
+“downgrade” similarly, doing the same steps in reverse.
+* Allows the scripts to execute in some sequential manner."
+HOMEPAGE="https://pypi.org/project/alembic/"
+COPYRIGHT="2011-2018 Mike Bayer"
+LICENSE="MIT"
+REVISION="1"
+SOURCE_URI="https://files.pythonhosted.org/packages/92/41/c01e9a2eaef90348cf7dea5054605c991633b5ca470574efe768b60ad5bc/alembic-$portVersion.tar.gz"
+SOURCE_DIR="alembic-$portVersion"
+CHECKSUM_SHA256="52d73b1d750f1414fa90c25a08da47b87de1e4ad883935718a8f36396e19e78e"
+
+ARCHITECTURES="any"
+
+PROVIDES="
+	$portName = $portVersion
+	cmd:alembic
+	"
+REQUIRES="
+	haiku
+	"
+
+BUILD_REQUIRES="
+	haiku_devel
+	"
+
+PYTHON_PACKAGES=(python3)
+PYTHON_VERSIONS=(3.6)
+for i in "${!PYTHON_PACKAGES[@]}"; do
+pythonPackage=${PYTHON_PACKAGES[i]}
+pythonVersion=${PYTHON_VERSIONS[$i]}
+BUILD_REQUIRES="$BUILD_REQUIRES
+	setuptools_$pythonPackage"
+BUILD_PREREQUIRES="$BUILD_PREREQUIRES
+	cmd:python$pythonVersion"
+done
+
+INSTALL()
+{
+	for i in "${!PYTHON_PACKAGES[@]}"; do
+		pythonPackage=${PYTHON_PACKAGES[i]}
+		pythonVersion=${PYTHON_VERSIONS[$i]}
+
+		python=python$pythonVersion
+		installLocation=$prefix/lib/$python/vendor-packages/
+		export PYTHONPATH=$installLocation:$PYTHONPATH
+		mkdir -p $installLocation
+		rm -rf build
+		$python setup.py build install \
+			--root=/ --prefix=$prefix
+	done
+}
+