Chapter 5. Common Protocols
Most of the time, you'll want to define objects that are highly customized to the needs of your application. This often means coming up with your own interfaces and APIs that are unique to your own code. The flexibility to do this is essential to the expansion capabilities of any system, but there is a price. Everything new you invent must be documented and understood by those who need to use it.
Understanding how to use the various classes made available by a framework can be quite a chore for users of that framework, even with proper documentation. A good way to ease the burden on users is to mimic interfaces they're already familiar with. There are many existing types that are standard issue in Python programming, ...
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