problem with closures

[alain]

Hi,

I have a problem with closures.
I am trying to implement yet another design by contract decorator which
would look like the following:
<pre>
def contract(f):
        def newf(*args, **kw):
                import new
                precondition =  new.function(f.func_code.co_consts[1],
                                                        f.func_globals,'pre',
                                                        f.func_defaults,
                                                        f.func_closure)
                precondition()
                result=f(*args, **kw)
                postcondition=new.function(f.func_code.co_consts[2],globals())
                postcondition(result)
                return result
        return newf
@contract
def foo(x,y,g=2,z=1):
        def pre():
                assert x>1 and 0<y<100
        def post(result):
                assert result >0
        print 'main'
        return x+y+z*g

print foo(2,5,4,69)
<pre>

The problem is that i get the following error message on line 7:
TypeError: arg 5 (closure) must be tuple

f.func_closure is indeed empty while
f.func_code.co_consts[1].co_freevars is logically equal to ('x','y').

Thanks for responding

Alain

-- 
http://mail.python.org/mailman/listinfo/python-list