use built-in function for norm

Author: musabkas

PathPlanning/ThetaStar/theta_star.py

@@ -99,7 +99,7 @@ def planning(self, sx, sy, gx, gy):
                     dy = py - y
 
                     # scale down vector for visibility
-                    norm = math.sqrt(dx*dx + dy*dy)
+                    norm = math.hypot(dx, dy)
                     dx /= norm
                     dy /= norm