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In the call to Bisection.solve, the question mark must be the Python function whose zero you want to find. In your case, it should be something reproducing the logic of IRRSolver::operator() in Mick Hittesdorf's code, i.e., something like this (which I haven't tested): cashflows = fixedRateBond.cashflows() npv = fixedRateBond.NPV() def ...


I also recommend to see: There are some good examples.

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