Type Hinting vs Type Checking and Preconditions

[Delaney, Timothy (Tim)]

bearophileHUGS at lycos.com wrote:

> You can look at this, its API looks very well thought out to me:
> http://oakwinter.com/code/typecheck/
> 
>> Now, on the other hand, if we were to introduce a purely optional
>> type hint to the function prototype, such as follows:
>> def multiplyByTwo(value:int): return value * 2
> 
> I don't think Python will have something like this...

It's actually something that has been being considered for Python 3.0
for a long time.

Search for `python optional static typing` for discussions - the first
two links from Google are blog entries by Guido from a year ago (there's
also a third one linked from PEP 3000).

Tim Delaney