By Michael Driscoll
Python 201 is the sequel to my first ebook, Python one hundred and one. if you happen to already recognize the fundamentals of Python and now you need to visit the subsequent point, then this is often the ebook for you! This booklet is for intermediate point Python programmers in basic terms. There will not be any newbie chapters right here. This e-book is predicated onPython three.
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You will note that we currently handle integers, strings and lists as the first 35 argument. If we were to call our add function with something else, such as a dictionary, then it would raise a NotImplementedError. Try running the code yourself. py", line 5, in add raise NotImplementedError('Unsupported type') NotImplementedError: Unsupported type As you can see, the code works exactly as advertised. It calls the appropriate function based on the first argument’s type. If the type isn’t handled, then we raise a NotImplementedError.
In this chapter, you learned some basic caching using lru_cache. Then we moved onto partials which lets you “freeze” a portion of your function’s arguments and/or keywords allowing you to create a new object that you can call. Next we used singledispatch to overload functions with Python. While it only allows function overloading based on the first argument, this is still a handy tool to add to your arsenal! Finally we looked at wraps which had a very narrow focus: namely it fixes docstrings and function names that have been decorated such that they don’t have the decorator’s docstring or name any more.
The functions inside functools are considered “higher-order” functions which can act on or return other functions. In this chapter we will be looking at the following portions of the functools package: • • • • lru_cache partials singledispatch wraps Let’s get started by learning how to create a simple cache with Python! lru_cache The functools module provides a handy decorator called lru_cache. 2. According to the documentation, it will “wrap a function with a memoizing callable that saves up to the maxsize most recent calls”.