Show e.errostr in IOError exception

resize.py

@@ -56,6 +56,7 @@ try:
         enhancer = ImageEnhance.Contrast(im)
         im = enhancer.enhance(1.05)
     im.save(outfile, "JPEG", quality=100)
-except IOError:
+except IOError as e:
     print("cannot create thumbnail for '%s'" % infile)
+    print "I/O error({0}): {1}".format(e.errno, e.strerror)
     sys.exit(os.EX_DATAERR)