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In the previous section, you saw that when you access an object of a derived class by using a reference to the base class, you get the members from the base class. Virtual methods allow a reference to the base class, to access up into the derived class. You can use a reference to a base class to call a method in the derived class, if the following are true: The method in the derived class and the method in the base class each have the same signature and return type. The method in the base class is labeled virtual. The method in the derived class is labeled override. For example, the following code shows the virtual and override modifiers on the methods in the base class and derived class. class MyBaseClass { virtual public void Print() ... class MyDerivedClass : MyBaseClass { override public void Print() // Base class

Listing 12 14. Doing MIME with Both Alternatives and Attachments #!/usr/bin/env python # Foundations of Python Network Programming - 12 - mime_gen_both.py from email.mime.text import MIMEText from email.mime.multipart import MIMEMultipart from email.mime.base import MIMEBase from email import utils, encoders import mimetypes, sys def def genpart(data, contenttype): maintype, subtype = contenttype.split('/') if maintype == 'text': retval = MIMEText(data, _subtype=subtype) else: retval = MIMEBase(maintype, subtype) retval.set_payload(data) encoders.encode_base64(retval) return retval attachment(filename): fd = open(filename, 'rb') mimetype, mimeencoding = mimetypes.guess_type(filename) if mimeencoding or (mimetype is None): mimetype = 'application/octet-stream' retval = genpart(fd.read(), mimetype) retval.add_header('Content-Disposition', 'attachment', filename = filename) fd.close() return retval

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messagetext = """Hello, This is a *great* test message from 12. -- Anonymous""" messagehtml = """Hello,<P> This is a <B>great</B> test message from 12. it!<P> -- <I>Anonymous</I>""" msg = MIMEMultipart() msg['To'] = 'recipient@example.com' msg['From'] = 'Test Sender <sender@example.com>' msg['Subject'] = 'Test Message, 12' msg['Date'] = utils.formatdate(localtime = 1) msg['Message-ID'] = utils.make_msgid() body = MIMEMultipart('alternative') body.attach(genpart(messagetext, 'text/plain')) I hope you enjoy I hope you enjoy it!

Figure 7-8 illustrates this set of virtual and override methods. Notice how the behavior differs from the previous case, where I used new to hide the base class members. When the Print method is called by using the reference to the base class (mybc), the method call is passed up to the derived class and executed, because of the following: The method in the base class is marked as virtual. There is a matching override method in the derived class. Figure 7-8 illustrates this by showing the arrow coming out the back of the virtual Print method and pointing at the override Print method.

body.attach(genpart(messagehtml, 'text/html')) msg.attach(body) for filename in sys.argv[1:]: msg.attach(attachment(filename)) print msg.as_string() The output from this program is large, so I won t show it here. You should also know that there is no fixed limit to how deep message components may be nested, though there is rarely any reason to go deeper than is shown here.

Larger: you need a new implementation for each type. The compiled version of each stack will be present, regardless of whether it is used. Easier to write. More error-prone to maintain, since all changes need to be applied for each applicable type.

Simple Object Access Protocol or Service Oriented Architecture Protocol (SOAP) is a protocol for exchanging XML-based messages over computer networks, normally using HTTP/HTTPS. SOAP forms the foundation layer of many web services, providing a basic messaging framework those more abstract layers can build on.

Python s email module can read a message from a file or a string, and generate the same kind of inmemory object tree that we were generating ourselves in the aforementioned listings. To understand the e-mail s content, all you have to do is step through its structure. You can even make adjustments to the message (for instance, you can remove an attachment), and then generate a fresh version of the message based on the new tree. Listing 12 5 shows a program that will read in a message and display its structure by walking the tree. Listing 12 15. Walking a Complex Message #!/usr/bin/env python # Foundations of Python Network Programming - 12 - mime_structure.py # This program requires Python 2.2.2 or above import sys, email def printmsg(msg, level = 0): prefix = "| " * level prefix2 = prefix + "|" print prefix + "+ Message Headers:" for header, value in msg.items(): print prefix2, header + ":", value if msg.is_multipart(): for item in msg.get_payload(): printmsg(item, level + 1)

Smaller: you only need one implementation regardless of the number of constructed types. Only types for which there is a constructed type are present in the executable. Harder to write. Easier to maintain, because modifications are only needed in one place.

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