Improved error handling.
diff --git a/Demo/scripts/from.py b/Demo/scripts/from.py
index 20771a0..21ca081 100755
--- a/Demo/scripts/from.py
+++ b/Demo/scripts/from.py
@@ -4,11 +4,22 @@
# Extension to multiple mailboxes and other bells & whistles are left
# as exercises for the reader.
-import posix
+import sys, posix
# Open mailbox file. Exits with exception when this fails.
-mail = open(posix.environ['MAIL'], 'r')
+try:
+ mailbox = posix.environ['MAIL']
+except RuntimeError:
+ sys.stderr.write \
+ ('Please set environment variable MAIL to your mailbox\n')
+ sys.exit(2)
+
+try:
+ mail = open(mailbox, 'r')
+except RuntimeError:
+ sys.stderr.write('Cannot open mailbox file: ' + mailbox + '\n')
+ sys.exit(2)
while 1:
line = mail.readline()