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Mon Apr 5 19:30:23 EDT 2004 · https://mail.python.org/pipermail/python-dev/2004-April/044096.html

> One thing I was thinking about (aloud on #python) was a validator 
> syntax, something resembling:
> 
>     def is_int(i):
>         return isinstance(number, int):
> 
>     def is_hashable(h):
>         try:
>             hash(h)
>             return True
>         except TypeError:
>             return False # or raise exception
> 
>     def func(is_int : number, hashable : key):
>         # code...

Please note that you seem to be using the syntax ``type: variable''.
We've settled on using ``variable: type'' instead.  (How to express
types is quite a different story...)

--Guido van Rossum (home page: http://www.python.org/~guido/)

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[Python-Dev] Re: Python-Dev Digest, Vol 9, Issue 17