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Code Issues Projects Releases Packages Wiki Activity Actions 8

Improved error handling.

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This commit is contained in:
Guido van Rossum 1991-12-18 13:38:42 +00:00
parent 5378d5c485
commit 5558b89320
1 changed files with 13 additions and 2 deletions
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15
Demo/scripts/from.py
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@ -4,11 +4,22 @@
# Extension to multiple mailboxes and other bells & whistles are left # Extension to multiple mailboxes and other bells & whistles are left
# as exercises for the reader. # as exercises for the reader.
import posix import sys, posix
# Open mailbox file. Exits with exception when this fails. # 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: while 1:
line = mail.readline() line = mail.readline()