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Asked: 2026-05-11T14:59:33+00:00

Are there any performance considerations for using a lot of generators chained together, as

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Are there any performance considerations for using a lot of generators chained together, as opposed to just a single generator.

For example:

def A(self, items):     for item in self.AB(items):         if object.A():             yield item  def AB(self, items):     for object in self.ABC(objects):         if object.A() or object.B():             yield object  def ABC(self, objects):     for object in objects:         if object.A() or object.B() or object.C():             yield object

Clearly calling A(objects) is going to go through three different generators, but in many situations it makes the code re-use better if there are different generators to handle different filtering. Can anyone indicate that there is a significant impact on performance using this technique?

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1 Answer

  1. There is nothing wrong with chaining generators, but in this example there is no reason for A to call self.AB, it can just loop over items to get the same result.

    You should write your code as clearly as you can and if it’s slow then use a profiler to determine where the bottleneck is. Contrived examples such as this one are too far from reality to be useful indicators of performance.

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