New package - py-networkx (https://networkx.github.io/).

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

@@ -0,0 +1,15 @@
+from spack import *
+
+class PyNetworkx(Package):
+    """NetworkX is a Python package for the creation, manipulation, and study of the structure, dynamics, and functions of complex networks."""
+    homepage = "http://networkx.github.io/"
+    url      = "https://pypi.python.org/packages/source/n/networkx/networkx-1.11.tar.gz"
+
+    version('1.11', '6ef584a879e9163013e9a762e1cf7cd1')
+
+    extends('python')
+
+    depends_on('py-decorator')
+
+    def install(self, spec, prefix):
+        python('setup.py', 'install', '--prefix=%s' % prefix)