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Here is how you might run the program: $ ./popconn.py pop.example.com guido Password: (type your password) You have 3 messages totaling 5675 bytes If you see output like this, then your first POP conversation has taken place successfully! When POP servers do not support SSL to protect your connection from snooping, they sometimes at least support an alternate authentication protocol called APOP, which uses a challenge-response scheme to assure that your password is not sent in the clear. (But all of your e-mail will still be visible to any third party watching the packets go by!) The Python Standard Library makes this very easy to attempt: just call the apop() method, then fall back to basic authentication if the POP server you are talking to does not understand. To use APOP but fall back to plain authentication, you could use a stanza like the one shown in Listing 14 2 inside your POP program (like Listing 14 1). Listing 14 2. Attempting APOP and Falling Back print "Attempting APOP authentication..." try: p.apop(user, passwd) except poplib.error_proto: print "Attempting standard authentication..." try: p.user(user) p.pass_(passwd) except poplib.error_proto, e: print "Login failed:", e sys.exit(1)

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To create a mashup with the Technorati block, select Create Stuff Mashup from the main menu. The mashup creator opens with the familiar blank canvas (see Figure 10-13).

Caution! As soon as a login succeeds by whatever method, some older POP servers will lock the mailbox. Locking might mean that no alterations to the mailbox may be made, or even that no more mail may be delivered until the lock is gone. The problem is that some POP servers do not properly detect errors, and will keep a box locked indefinitely if your connection gets hung up without your calling quit(). At one time, the world s most popular POP server fell into this category! So it is vital to always call quit() in your Python programs when finishing up a POP session. You will note that all of the program listings shown here are careful to always quit() down in a finally block that Python is guaranteed to execute last.

There are a number of different last names represented in this table, so let s ask for all individuals with the last name Roe residing in the database. To do this, the SELECT statement is

The preceding example showed you stat(), which returns the number of messages in the mailbox and their total size. Another useful POP command is list(), which returns more detailed information about each message. The most interesting part is the message number, which is required to retrieve messages later. Note that there may be gaps in message numbers: a mailbox may, for example, contain message numbers 1, 2, 5, 6, and 9. Also, the number assigned to a particular message may be different on each connection you make to the POP server. Listing 14 3 shows how to use the list() command to display information about each message. Listing 14 3. Using the POP list() Command #!/usr/bin/env python # POP mailbox scanning - 14 - mailbox.py import getpass, poplib, sys if len(sys.argv) != 3: print 'usage: %s hostname user' % sys.argv[0] exit(2) hostname, user = sys.argv[1:] passwd = getpass.getpass() p = poplib.POP3_SSL(hostname) try: p.user(user) p.pass_(passwd) except poplib.error_proto, e: print "Login failed:", e else: response, listings, octet_count = p.list() for listing in listings: number, size = listing.split() print "Message %s has %s bytes" % (number, size)

combined with a WHERE clause. The id column is not really that interesting, so ask for the firstname and lastname columns instead of using an asterisk: SELECT firstname, lastname FROM names WHERE lastname = 'Roe' The results from the query are shown in the following table:

WHERE clauses contain several comparisons that can be combined using AND, OR, NOT, and parentheses to form more complex filters. Notice that the order of the first names in the preceding table is not ideal. You can use the ORDER BY clause to specify the sort order: SELECT firstname, lastname FROM names WHERE lastname = 'Roe' ORDER BY firstname The results from the command are shown in the following table (the ordering has been fixed):

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