Chaining multiple class arguments(tried many ways)

Question

How should I initialize multiple class arguments that came as chain and then calculate sum of them?

I’ve tried many ways but NOTHING

Do you have any idea?

>>> Chain(2.5)(2)(2)(2.5) # sum
9

>>> Chain(3)(1.5)(2)(3) # sum
9.5

Asked By: Harez

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Source

Answer 1

In general, you’ll want to add a __call__ method to your class so that calling an instance returns a new instance. Your class should also subclass the type matching the result you want.

In this specific case, the new instance could, for example, maintain a running sum of the initial value and all successive arguments.

class Chain(float):
    def __call__(self, x):
        return Chain(self + x)

Then

>>> Chain(2.5)
2.5
>>> Chain(2.5)(2)
4.5
>>> Chain(2.5)(2)(2)
6.5
>>> Chain(2.5)(2)(2)(2.5)
9.0

Answered By: chepner

Chaining multiple class arguments(tried many ways)

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