Make Spack core PEP8 compliant.

bin/spack

@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# flake8: noqa
 ##############################################################################
 # Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
 # Produced at the Lawrence Livermore National Laboratory.
@@ -24,9 +25,10 @@
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ##############################################################################
 import sys
-if not sys.version_info[:2] >= (2,6):
+if not sys.version_info[:2] >= (2, 6):
     v_info = sys.version_info[:3]
-    sys.exit("Spack requires Python 2.6 or higher.  This is Python %d.%d.%d." % v_info)
+    sys.exit("Spack requires Python 2.6 or higher. "
+             "This is Python %d.%d.%d." % v_info)
 
 import os
 
@@ -62,7 +64,8 @@ for pyc_file in orphaned_pyc_files:
     try:
         os.remove(pyc_file)
     except OSError as e:
-        print "WARNING: Spack may fail mysteriously. Couldn't remove orphaned .pyc file: %s" % pyc_file
+        print ("WARNING: Spack may fail mysteriously. "
+               "Couldn't remove orphaned .pyc file: %s" % pyc_file)
 
 # If there is no working directory, use the spack prefix.
 try:
@@ -128,6 +131,7 @@ if len(sys.argv) == 1:
 # actually parse the args.
 args = parser.parse_args()
 
+
 def main():
     # Set up environment based on args.
     tty.set_verbose(args.verbose)
@@ -148,7 +152,7 @@ def main():
 
     # If the user asked for it, don't check ssl certs.
     if args.insecure:
-        tty.warn("You asked for --insecure, which does not check SSL certificates.")
+        tty.warn("You asked for --insecure. Will NOT check SSL certificates.")
         spack.curl.add_default_arg('-k')
 
     # Try to load the particular command asked for and run it
@@ -167,7 +171,8 @@ def main():
     elif isinstance(return_val, int):
         sys.exit(return_val)
     else:
-        tty.die("Bad return value from command %s: %s" % (args.command, return_val))
+        tty.die("Bad return value from command %s: %s"
+                % (args.command, return_val))
 
 if args.profile:
     import cProfile