[Python-3000] Math in Python 3.0

["Martin v. Löwis"]

Giovanni Bajo wrote:
>>> @overloaded
>>> def sqrt(value):
>>>     raise TypeError("Cannot take square root of %s" %
>>> type(value).__name__)
>>>
>>> @sqrt.overload
>>> def sqrt_float(value : float):
>>>     return math.sqrt(value)
>>>
>> So where would that sqrt function live?
> 
> "math" would be fine for all builtin types. For other types, imported from
> modules, such as numpy, they could add their overload to math.sqrt at
> import-time.

That wouldn't quite work: sqrt(float) would cause a stack overflow for
calling itself.

In any case, I still wonder whether these functions should be unified
when they have different semantics (e.g. when passing negative ints or
floats to math.sqrt vs. cmath.sqrt).

Regards,
Martin