Re: Retour sur cpython ?

Facile !

In [1]: class Typed(object):
 ...: def __init__(self, t):
 ...: self.type = t
 ...: def __setattr__(self, name, value):
 ...: if hasattr(self,"type"):
 ...: self.__dict__[name] = self.type(value)
 ...: else:
 ...: self.__dict__["type"] = value
 ...: 
In [2]: Int = Typed(int)
In [3]: Int.a = 1.23
In [4]: Int.a
Out[4]: 1
In [5]: Int.a = "toto"
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-5-21393c614655> in <module>()
----> 1 Int.a = "toto"
<ipython-input-1-e04bf26fc6b5> in __setattr__(self, name, value)
 4 def __setattr__(self, name, value):
 5 if hasattr(self,"type"):
----> 6 self.__dict__[name] = self.type(value)
 7 else:
 8 self.__dict__["type"] = value
ValueError: invalid literal for int() with base 10: 'toto'
In [6]: Float = Typed(float)
In [7]: Float.toto = 1
In [8]: Float.toto
Out[8]: 1.0
In [9]: Str = Typed(str)
In [10]: Str.truc = 1
In [11]: Str.truc
Out[11]: '1'

Implémentation minimale, on peut raffiner, mais c'est l'idée ;-)