Mercurial > cpython-lru_cache-weakref

annotate Demo/scripts/from.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents d02ce30d7ddb
children 73758db2f464
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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d02ce30d7ddb bin/python
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1 #! /usr/local/bin/python
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2
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3 # Print From and Subject of messages in $MAIL.
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4 # Extension to multiple mailboxes and other bells & whistles are left
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5 # as exercises for the reader.
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6
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7 import sys, os
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8
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9 # Open mailbox file. Exits with exception when this fails.
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10
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11 try:
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12 mailbox = os.environ['MAIL']
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13 except (AttributeError, KeyError):
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14 sys.stderr.write('No environment variable $MAIL\n')
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15 sys.exit(2)
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16
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17 try:
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18 mail = open(mailbox, 'r')
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19 except IOError:
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20 sys.stderr.write('Cannot open mailbox file: ' + mailbox + '\n')
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21 sys.exit(2)
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22
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23 while 1:
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24 line = mail.readline()
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25 if not line: break # EOF
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26 if line[:5] == 'From ':
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27 # Start of message found
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28 print line[:-1],
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29 while 1:
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30 line = mail.readline()
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31 if not line: break # EOF
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32 if line == '\n': break # Blank line ends headers
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33 if line[:8] == 'Subject:':
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34 print `line[9:-1]`,
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35 print