small modernization

Packages/PyLOOS/protein_tilt.py

@@ -12,36 +12,36 @@
     print("       points in the +z direction")
     sys.exit()
 
-#print len(sys.argv)
 print("#", " ".join(sys.argv))
 system_filename = sys.argv[1]
 traj_filename = sys.argv[2]
 selections = sys.argv[3:]
 
-
 system = loos.createSystem(system_filename)
 traj = loos.pyloos.Trajectory(traj_filename, system)
 
 helices = []
 for s in selections:
     helices.append(loos.selectAtoms(system, s))
 
+to_degrees = 180.0/math.pi
+
 print("#Frame\tAngle\tCosine")
 
-for frame in traj:
+for _ in traj:
 
-    vec = loos.GCoord(0., 0., 0.)
+    vec = loos.GCoord(0.0, 0.0, 0.0)
     for h in helices:
         pca = h.principalAxes()
         v = pca[0]
         if v.z() < 0:
-            v *= -1.
+            v *= -1.0
         vec += v
 
     cosine = vec.z() / vec.length()
 
     cosine = max(-1.0, cosine)
     cosine = min(1.0, cosine)
-    ang = math.acos(cosine) * 180./math.pi
+    ang = math.acos(cosine) * to_degrees
 
     print(traj.index(), ang, cosine)