python/Demo/scripts/from.py at master · pylee/python · GitHub

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#! /usr/bin/env python

# Print From and Subject of messages in $MAIL.

# Extension to multiple mailboxes and other bells & whistles are left

# as exercises for the reader.

import sys, os

# Open mailbox file. Exits with exception when this fails.

try:

mailbox = os.environ['MAIL']

except (AttributeError, KeyError):

sys.stderr.write('No environment variable $MAIL\n')

sys.exit(2)

try:

mail = open(mailbox)

except IOError:

sys.exit('Cannot open mailbox file: ' + mailbox)

while 1:

line = mail.readline()

if not line:

break # EOF

if line.startswith('From '):

# Start of message found

print line[:-1],

while 1:

line = mail.readline()

if not line or line == '\n':

break

if line.startswith('Subject: '):

print repr(line[9:-1]),

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