Rolf Wester wrote: > The reason to use exec is just laziness. I have quite a lot of classes > representing material data and every class has a number of parameters. > The parameter are Magnitude objects (they have a value and a unit and > overloaded special functions to correctly handle the units). I want to > have getter functions that either return the Magnitude object or just the > value: > > iron = Iron() > iron.rho(0) => value > iron.rho() => Magnitude object > > def rho(self, uf=1): > if uf == 1: > return self._rho > else: > return self._rho.val > > And because this would mean quite a lot of writing I tried to do it with > exec.
Make the Magnitude class callable then: >>> class Magnitude(object): ... def __init__(self, value): ... self.value = value ... def __call__(self, uf=1): ... if uf == 1: ... return self ... return self.value ... >>> class Iron(object): ... def __init__(self): ... self.rho = Magnitude(42) ... >>> iron = Iron() >>> iron.rho() <__main__.Magnitude object at 0x7fb94062be10> >>> iron.rho(0) 42 -- http://mail.python.org/mailman/listinfo/python-list
