votes up 2

The map-like callable must be of the form f(func, iterable), returning a sequence of numbers the same length as 'iterable'

Package:
scipy
github stars 8546
Exception Class:
RuntimeError

Raise code

            calc_energies = list(self._mapwrapper(self.func,
                                                  parameters_pop[0:nfevs]))
            calc_energies = np.squeeze(calc_energies)
        except (TypeError, ValueError) as e:
            # wrong number of arguments for _mapwrapper
            # or wrong length returned from the mapper
            raise RuntimeError(
                "The map-like callable must be of the form f(func, iterable), "
                "returning a sequence of numbers the same length as 'iterable'"
            ) from e

        if calc_energies.size != nfevs:
            raise RuntimeError("func(x, *args) must return a scalar value")

        ener

Comment explaining raise

wrong number of arguments for _mapwrapper or wrong length returned from the mapper

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