Beginning Python: From Novice to Professional (2nd Edition) by Magnus Lie Hetland

By Magnus Lie Hetland

Achieve a primary knowing of Python's syntax and contours with the second one version of starting Python, an up–to–date advent and functional reference. overlaying a wide range of Python–related programming subject matters, together with addressing language internals, database integration, community programming, and internet prone, you'll be guided through sound improvement rules. Ten accompanying tasks will make sure you can get your palms soiled in no time.

Updated to mirror the most recent in Python programming paradigms and several other of the main the most important positive factors present in Python 3.0 (otherwise often called Python 3000), complex subject matters, equivalent to extending Python and packaging/distributing Python functions, also are lined.

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Extra resources for Beginning Python: From Novice to Professional (2nd Edition)

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Keying on the ID Another thing that can be done for relatively safe places to store on the instance is to use the id() of the descriptor to generate a location on the instance, somehow. It may seem strange, but the id of the descriptor can be used as the key on the instance's location. It seems strange that a non-string can be used as the key in an instance dictionary, but it can. __dict__[id(desc)] and not via dot notation or get/set/hasattr(). This may actually seem like a plus, since it prevents unwanted access to the attribute, but it also messes up dir(instance), which raises an exception when it finds a non-string key.

Part 2 is filled to the brim with those. CHAPTER 6 Which Methods Are Needed? When designing a descriptor, it must be decided which methods will be included. It can sometimes help to decide right away if the descriptor should be a data or nondata descriptor, but sometimes it works better to first “discover” which kind of descriptor it is. The method __delete__() is rarely ever needed, even if it is a data descriptor. That doesn’t mean it shouldn’t ever be included, however. If the descriptor is going to be released into open domain, it wouldn’t hurt to add the __delete__() method simply for completeness for cases when a user decides to call del on it.

Jacob Zimmerman 2016 J. 1007/978-1-4842-2505-9_6 25 Chapter 6 ■ Which Methods Are Needed? When the descriptor is a class-level descriptor (usually nondata), implementing __get__() without using instance is trivial, since that’s the intended use. But when a descriptor is meant for instance-level use and the descriptor is not being called from an instance, it can be difficult to figure out what to do. Here, I present a few options. Raise Exception or Return self The first thing that may come to mind is to raise an exception, since class-level access is not intended, but this should be avoided.

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