Breaking a few eggs
The power of the layer model of network protocols is that a higher layer can easily build on the services provided by the lower layers and this enables them to add new services to the network. Python provides modules for interfacing with protocols at different levels in the network stack, and modules that support higher-layer protocols follow the aforementioned principle by using the interfaces supplied by the lower level protocols. How can we visualize this?
Well, sometimes a good way to see inside something like this is by breaking it. So, let's break Python's network stack. Or, more specifically, let's generate a traceback.
Yes, this means that the first piece of Python that we're going to write is going to generate an exception. ...
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