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| author | Guido van Rossum <guido@python.org> | 1991-12-18 13:38:42 (GMT) |
|---|---|---|
| committer | Guido van Rossum <guido@python.org> | 1991-12-18 13:38:42 (GMT) |
| commit | 5558b89320744797ff6c97c70c2308d805e7ee3d (patch) | |
| tree | 8ccc7efc4b6a7589a935752e36ddcda592af4792 /Demo/scripts/from.py | |
| parent | 5378d5c485f8204630ac0e7db3276d3a852b4317 (diff) | |
| download | cpython-5558b89320744797ff6c97c70c2308d805e7ee3d.zip cpython-5558b89320744797ff6c97c70c2308d805e7ee3d.tar.gz cpython-5558b89320744797ff6c97c70c2308d805e7ee3d.tar.bz2 | |
Improved error handling.
Diffstat (limited to 'Demo/scripts/from.py')
| -rwxr-xr-x | Demo/scripts/from.py | 15 |
1 files changed, 13 insertions, 2 deletions
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() |