Supported python build in host side.

The base module handles all the common functionalites, such as version
compatibilty check, version variations split, source file format check,
source/data file duplicate check.

The library/binary module focuses on how to generate binary build actions,
such as setting up stub script, zipping, filling in __init__.py in
runfiles dir tree.

Bug: b/31676493
Test: go test under python package

Change-Id: I06608369f350f7195873d459e1c8d1bdb811e77e

python/library.go

@@ -0,0 +1,43 @@
+// Copyright 2017 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package python
+
+// This file contains the module types for building Python library.
+
+import (
+	"github.com/google/blueprint"
+
+	"android/soong/android"
+)
+
+func init() {
+	android.RegisterModuleType("python_library_host", PythonLibraryHostFactory)
+}
+
+type PythonLibrary struct {
+	pythonBaseModule
+}
+
+var _ PythonSubModule = (*PythonLibrary)(nil)
+
+func PythonLibraryHostFactory() (blueprint.Module, []interface{}) {
+	module := &PythonLibrary{}
+
+	return InitPythonBaseModule(&module.pythonBaseModule, module, android.HostSupportedNoCross)
+}
+
+func (p *PythonLibrary) GeneratePythonAndroidMk() (ret android.AndroidMkData, err error) {
+	return
+}