Showing content from http://svn.python.org/projects/python/branches/py3k-urllib/Demo/scripts/from.py below:
#! /usr/bin/env python3 # 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], end=' ') while 1: line = mail.readline() if not line or line == '\n': break if line.startswith('Subject: '): print(repr(line[9:-1]), end=' ') print()
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