style: make core comply with pep8-naming

lib/spack/llnl/util/multiproc.py

@@ -39,10 +39,10 @@ def fun(pipe, x):
     return fun
 
 
-def parmap(f, X):
-    pipe = [Pipe() for x in X]
+def parmap(f, elements):
+    pipe = [Pipe() for x in elements]
     proc = [Process(target=spawn(f), args=(c, x))
-            for x, (p, c) in zip(X, pipe)]
+            for x, (p, c) in zip(elements, pipe)]
     [p.start() for p in proc]
     [p.join() for p in proc]
     return [p.recv() for (p, c) in pipe]