Fixed shebangs, added error checking

samples/python2/facedetect.py

@@ -1,8 +1,10 @@
-#/usr/bin/env python
+#!/usr/bin/env python
 
 import numpy as np
 import cv2
 import cv2.cv as cv
+
+# local modules
 from video import create_capture
 from common import clock, draw_str
 
@@ -26,8 +28,10 @@ if __name__ == '__main__':
     print help_message
 
     args, video_src = getopt.getopt(sys.argv[1:], '', ['cascade=', 'nested-cascade='])
-    try: video_src = video_src[0]
-    except: video_src = 0
+    try:
+        video_src = video_src[0]
+    except:
+        video_src = 0
     args = dict(args)
     cascade_fn = args.get('--cascade', "../../data/haarcascades/haarcascade_frontalface_alt.xml")
     nested_fn  = args.get('--nested-cascade', "../../data/haarcascades/haarcascade_eye.xml")