New package - py-decorator (https://github.com/micheles/decorator).

var/spack/repos/builtin/packages/py-decorator/package.py

+from spack import *
+
+class PyDecorator(Package):
+    """The aim of the decorator module it to simplify the usage of decorators for the average programmer, and to popularize decorators by showing various non-trivial examples."""
+    homepage = "https://github.com/micheles/decorator"
+    url      = "https://pypi.python.org/packages/source/d/decorator/decorator-4.0.9.tar.gz"
+
+    version('4.0.9', 'f12c5651ccd707e12a0abaa4f76cd69a')
+
+    extends('python')
+
+    def install(self, spec, prefix):
+        python('setup.py', 'install', '--prefix=%s' % prefix)