addressing coding style rules

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

-from spack import *
+from spack import version, extends, depends_on, python
+from spack import Package
+
 
 class PyGenshi(Package):
     """Python toolkit for generation of output for the web"""
     homepage = "https://genshi.edgewall.org/"
     url      = "http://ftp.edgewall.com/pub/genshi/Genshi-0.7.tar.gz"
 
-    version('0.7'  , '54e64dd69da3ec961f86e686e0848a82')
+    version('0.7', '54e64dd69da3ec961f86e686e0848a82')
     version('0.6.1', '372c368c8931110b0a521fa6091742d7')
-    version('0.6'  , '604e8b23b4697655d36a69c2d8ef7187')
+    version('0.6', '604e8b23b4697655d36a69c2d8ef7187')
 
     extends("python")
     depends_on("py-setuptools")

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

-from spack import *
+from spack import depends_on, extends, python, version
+from spack import Package
+
 
 class PyAstroid(Package):
     homepage = "https://www.astroid.org/"

var/spack/repos/builtin/packages/py-jinja2/package.py

-from spack import *
+from spack import depends_on, extends, python, version
+from spack import Package
+
 
 class PyJinja2(Package):
     """
     Jinja2 is a template engine written in pure Python. It provides
-    a Django inspired non-XML syntax but supports inline expressions 
+    a Django inspired non-XML syntax but supports inline expressions
     and an optional sandboxed environment.
     """
 
     homepage = "http://jinja.pocoo.org/"
     url      = "https://github.com/pallets/jinja/archive/2.8.tar.gz"
 
-    version('2.8'  , '4114200650d7630594e3bc70af23f59e')
+    version('2.8', '4114200650d7630594e3bc70af23f59e')
     version('2.7.3', '55b87bdc8e585b8b5b86734eefce2621')
     version('2.7.2', '8e8f226809ae6363009b9296e30adf30')
     version('2.7.1', '69b6675553c81b1087f95cae7f2179bb')
-    version('2.7'  , 'ec70433f325051dcedacbb2465028a35')
+    version('2.7', 'ec70433f325051dcedacbb2465028a35')
 
     extends("python")
     depends_on("py-setuptools")
     depends_on("py-markupsafe")
-    
+
     def install(self, spec, prefix):
         python('setup.py', 'install', '--prefix=%s' % prefix)
 

var/spack/repos/builtin/packages/py-logilab-common/package.py

-from spack import *
+from spack import depends_on, extends, python, version
+from spack import Package
+
 
 class PyLogilabCommon(Package):
     """Common modules used by Logilab projects"""

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

-from spack import *
+from spack import depends_on, extends, python, version
+from spack import Package
+
 
 class PyMarkupsafe(Package):
     """
-    MarkupSafe is a library for Python that implements a unicode 
-    string that is aware of HTML escaping rules and can be used 
+    MarkupSafe is a library for Python that implements a unicode
+    string that is aware of HTML escaping rules and can be used
     to implement automatic string escaping. It is used by Jinja 2,
     the Mako templating engine, the Pylons web framework and many more.
     """
-    
+
     homepage = "http://www.pocoo.org/projects/markupsafe/"
     url      = "https://github.com/pallets/markupsafe/archive/0.23.tar.gz"
 

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

-from spack import *
+from spack import depends_on, extends, python, version
+from spack import Package
+
 
 class PyMistune(Package):
     """
@@ -8,10 +10,10 @@ class PyMistune(Package):
     url      = "https://github.com/lepture/mistune/archive/v0.7.1.tar.gz"
 
     version('0.7.1', '0d9c29700c670790c5b2471070d32ec2')
-    version('0.7'  , '77750ae8b8d0d584894224a7e0c0523a')
-    version('0.6'  , 'd4f3d4f28a69e715f82b591d5dacf9a6')
+    version('0.7', '77750ae8b8d0d584894224a7e0c0523a')
+    version('0.6', 'd4f3d4f28a69e715f82b591d5dacf9a6')
     version('0.5.1', '1c6cfce28a4aa90cf125217cd6c6fe6c')
-    version('0.5'  , '997736554f1f95eea78c66ae339b5722')
+    version('0.5', '997736554f1f95eea78c66ae339b5722')
 
     extends('python')
     depends_on('py-setuptools')

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

-from spack import *
+from spack import depends_on, extends, python, version
+from Spack import Package
+
 
 class PyPrettytable(Package):
     """
     PrettyTable is a simple Python library designed to make
-    it quick and easy to represent tabular data in visually 
+    it quick and easy to represent tabular data in visually
     appealing ASCII tables
     """
     homepage = "https://code.google.com/archive/p/prettytable/"
@@ -13,6 +15,6 @@ class PyPrettytable(Package):
 
     extends("python")
     depends_on("py-setuptools")
-    
+
     def install(self, spec, prefix):
         python('setup.py', 'install', '--prefix=%s' % prefix)

var/spack/repos/builtin/packages/py-py2neo/package.py

-from spack import *
+from spack import depends_on, extends, python, version
+from spack import Package
+
 
 class PyPy2neo(Package):
     """FIXME: put a proper description of your package here."""

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

-from spack import *
+from spack import depends_on, extends, python, version
+from spack import Package
+
 
 class PyStorm(Package):
     """Storm is an object-relational mapper (ORM) for Python"""
@@ -12,4 +14,3 @@ class PyStorm(Package):
 
     def install(self, spec, prefix):
         python('setup.py', 'install', '--prefix=%s' % prefix)
-