Issue #4072: Restore build_py_2to3. Add a distutils demo for
build_py_2to3.
diff --git a/Demo/distutils/test2to3/setup.py b/Demo/distutils/test2to3/setup.py
new file mode 100644
index 0000000..3abb5ff
--- /dev/null
+++ b/Demo/distutils/test2to3/setup.py
@@ -0,0 +1,18 @@
+# -*- coding: iso-8859-1 -*-
+from distutils.core import setup
+
+try:
+    from distutils.command.build_py import build_py_2to3 as build_py
+except ImportError:
+    from distutils.command.build_py import build_py
+
+setup(
+    name = "test2to3",
+    version = "1.0",
+    description = "2to3 distutils test package",
+    author = "Martin v. Löwis",
+    author_email = "python-dev@python.org",
+    license = "PSF license",
+    packages = ["test2to3"],
+    cmdclass = {'build_py':build_py}
+)