Transcription of Python Dependency Injection
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Python Dependency Injection
Copyright 2008, Google Inc Python Dependency InjectionAlex Martelli "levels" of this talk2 ShuHaRiPyDP("Retain")("Detach")("Transce nd") 3 The novice goes astray and says, "The Art failed me."The master goes astray and says,"I failed the Art." Dependency Injection DP4 Name: " Dependency Injection "Forces: an object depends on other concrete objects which it instantiates (or accesses as singletons, ..)we may want to control dependencies for all the usual good reasonsin particular, unit-testing may require mocking otherwise-concrete objectswe'll see examples & alternative solutions throughout the rest of this talkA simple schedulerclass ss(object): def __init__(self): = ().next = () def AddEvent(self, when, c, *a, **k): ((when, (), c, a, k)) def Run(self): while : when, n, c, a, k = () (when - ()) c(*a, **k) 5(A "side note")class PriorityQueue(object): def __init__(self): = [] def __len__(self): return len( ) def push(self, obj): ( , obj) def pop(self): return ( )6 Fine, do you test ss without long waits?
Some issues with TM inheritance gives strong, inflexible coupling a customized-scheduler has complex, specialized extra logic far from ideal for either unit-testing or
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