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Listing 13 2. A More Cautious SMTP Client #!/usr/bin/env python # SMTP transmission with debugging - 13 - debug.py import sys, smtplib, socket if len(sys.argv) < 4: print "usage: %s server fromaddr toaddr [toaddr...]" % sys.argv[0] sys.exit(2) server, fromaddr, toaddrs = sys.argv[1], sys.argv[2], sys.argv[3:] message = """To: %s From: %s Subject: Test Message from simple.py Hello, This is a test message sent to you from the debug.py program in Foundations of Python Network Programming. """ % (', '.join(toaddrs), fromaddr) try: s = smtplib.SMTP(server) s.set_debuglevel(1) s.sendmail(fromaddr, toaddrs, message) except (socket.gaierror, socket.error, socket.herror, smtplib.SMTPException), e: print " *** Your message may not have been sent!" print e sys.exit(1) else: print "Message successfully sent to %d recipient(s)" % len(toaddrs) This program looks similar to the last one. However, the output will be very different; take a look at Listing 13 3 for an example. Listing 13 3. Debugging Output from smtplib $ ./debug.py localhost foo@example.com jgoerzen@complete.org send: 'ehlo localhost\r\n' reply: '250-localhost\r\n' reply: '250-PIPELINING\r\n' reply: '250-SIZE 20480000\r\n' reply: '250-VRFY\r\n' reply: '250-ETRN\r\n' reply: '250-STARTTLS\r\n' reply: '250-XVERP\r\n' reply: '250 8BITMIME\r\n' reply: retcode (250); Msg: localhost PIPELINING SIZE 20480000 VRFY

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The configuration for the default implementation is: <barcode> < upc-a > <height>{ length:15mm}</height> <module-width>{length:0.33mm}</module-width> ...

Literals for real numbers consist of the following: Decimal digits An optional decimal point An optional exponent part An optional suffix For example, the following code shows various formats of literals of the real types: float double double double f1 d1 d2 d3 = = = = 236F; 236.714; .35192; 6.338e-26;

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ETRN STARTTLS XVERP 8BITMIME send: 'mail FROM:<foo@examplecom> size=157\r\n' reply: '250 Ok\r\n' reply: retcode (250); Msg: Ok send: 'rcpt TO:<jgoerzen@completeorg>\r\n' reply: '250 Ok\r\n' reply: retcode (250); Msg: Ok send: 'data\r\n' reply: '354 End data with <CR><LF><CR><LF>\r\n' reply: retcode (354); Msg: End data with <CR><LF><CR><LF> data: (354, 'End data with <CR><LF><CR><LF>') send: 'To: jgoerzen@completeorg\r\n From: foo@examplecom\r\n Subject: Test Message from simplepy\r\n \r\n Hello,\r\n \r\n This is a test message sent to you from simplepy and smtplib \r\n \r\n' reply: '250 Ok: queued as 8094C18C0\r\n' reply: retcode (250); Msg: Ok: queued as 8094C18C0 data: (250, 'Ok: queued as 8094C18C0') Message successfully sent to 1 recipient(s) From this example, you can see the conversation that smtplib is having with the SMTP server over the network.

The valid formats for real literals are shown in Figure 8-2. Components with names in square brackets are optional. The real suffixes and their meanings are shown in Table 8-2.

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As you implement code that uses more advanced SMTP features, the details shown here will be more important, so let s look at what s happening First, the client (the smtplib library) sends an EHLO command (an extended successor to a more ancient command that was named, more readably, HELO) with your hostname in it The remote server responds with its hostname, and lists any optional SMTP features that it supports Next, the client sends the mail from command, which states the envelope sender e-mail address and the size of the message The server at this moment has the opportunity to reject the message (for example, because it thinks you are a spammer); but in this case, it responds with 250 Ok (Note that in this case, the code 250 is what matters; the remaining text is just a human-readable comment and varies from server to server.

The Popfly Block Creator can be opened by selecting Create Stuff Block from the main menu. The Block Creator will open an unsaved block (see Figure 10-1). The Block Creator has two editing views: Block Description (which defines the operations and properties of the block) and Block Code (which executes the functionality of the block). Toggle between by clicking the tabs. When a block is first created, you see XML and JavaScript comments prompting you to place your description and code into the respective editors. To the left of the editors is the familiar Blocks window. If you recall, this window contains the categorized list of blocks that are available to use in Popfly. You can easily find blocks by typing keywords into the search box at the top of the window. In 7, we examined the code of the RSS block. To find that block here, type RSS into the search box. You should see the results in the Blocks window (see Figure 10-2).

Note Real literals without a suffix are of type double, not float!

) Then the client sends a rcpt to command, with the envelope recipient that we talked so much about earlier in this chapter; you can finally see that, indeed, it is transmitted separately from the text of the message itself when using the SMTP protocol If you were sending the message to more than one recipient, they would each be listed on the rcpt to line Finally, the client sends a data command, transmits the actual message (using verbose carriagereturn-linefeed line endings, you will note, per the Internet e-mail standard), and finishes the conversation The smtplib module is doing all this automatically for you in this example In the rest of the chapter, we will look at how to take more control of the process so you can take advantage of some more advanced features..

java upc-a

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UPC-A barcode generator can print UPC-A and saved it as GIF and JPEG images using Java class library. Generated UPC-A barcode images can be displayed ...

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