Question: Why is there a __str__ method in both AbstractCollection and AbstractBag? What is different about them? What is the reasoning/motivation behind this difference? Why is

Why is there a __str__ method in both AbstractCollection and AbstractBag? What is different about them? What is the reasoning/motivation behind this difference? Why is there an __eq__ method in both AbstractCollection and AbstractBag? What is different about them? What is the reasoning/motivation behind this difference?

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