Use exceptions uinstead of error message for non existing files

1 files changed, 9 insertions, 5 deletions

diff --git a/src/python/example/alpha_complex_diagram_persistence_from_off_file_example.py b/src/python/example/alpha_complex_diagram_persistence_from_off_file_example.py
index 6afaf533..727af4fa 100755
--- a/src/python/example/alpha_complex_diagram_persistence_from_off_file_example.py
+++ b/src/python/example/alpha_complex_diagram_persistence_from_off_file_example.py
@@ -1,12 +1,15 @@
 #!/usr/bin/env python
 
 import argparse
+import errno
+import os
 import matplotlib.pyplot as plot
-import sys
 import gudhi
 
-""" This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
-    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+""" This file is part of the Gudhi Library - https://gudhi.inria.fr/ -
+    which is released under MIT.
+    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full
+    license details.
     Author(s):       Vincent Rouvreau
 
     Copyright (C) 2016 Inria
@@ -42,7 +45,7 @@ args = parser.parse_args()
 with open(args.file, "r") as f:
     first_line = f.readline()
     if (first_line == "OFF\n") or (first_line == "nOFF\n"):
-        print("#####################################################################")
+        print("##############################################################")
         print("AlphaComplex creation from points read in a OFF file")
 
         message = "AlphaComplex with max_edge_length=" + repr(args.max_alpha_square)
@@ -65,6 +68,7 @@ with open(args.file, "r") as f:
             gudhi.plot_persistence_diagram(diag, band=args.band)
             plot.show()
     else:
-        print(args.file, "is not a valid OFF file", file=sys.stderr)
+        raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT),
+                                args.file)
 
     f.close()