meson: support for python packaging

python/graphenelibos/__init__.py

@@ -0,0 +1,3 @@
+'''Python support for Graphene'''
+
+__version__ = '@VERSION@'

python/graphenelibos/meson.build

@@ -0,0 +1,12 @@
+conf = configuration_data()
+conf.set('VERSION', meson.project_version())
+
+init_py = configure_file(
+    input: '__init__.py',
+    output: '__init__.py',
+    configuration: conf,
+)
+
+python3.install_sources([
+    init_py,
+], subdir: 'graphenelibos')

python/meson.build

@@ -0,0 +1 @@
+subdir('graphenelibos')