I've created a bug report about this:
http://trac.sagemath.org/sage_trac/ticket/9627

Soroosh

On Wed, Jul 28, 2010 at 2:58 PM, Harald Schilly <[email protected]>wrote:

> Hello sage-devel, I got this from the "report a problem" bugreport
> (observed on sagenb.org) and I can confirm this using sage 4.5, ubuntu
> 10.4, intel 32bit
>
> The problem is that a big integer expression is not converted
> correctly to a Python 'int'
>
> sage: z = var('z'); f(z) = z^2 + 1
> sage: def ppol(n,z):
>          g = f(z)
>          for i in range(0, n-1):
>              g = f(g)
>          return g
>
> sage: h = ppol(9,1)
> sage: h
>
> 3791862310265926082868235028027893277370233152247388584761734150717768254410341175325352026
> sage: type(h)
> <type 'sage.symbolic.expression.Expression'>
> sage: ZZ(h)
>
> 3791862310265926082868235028027893277370233152247388584761734150717768254410341175325352026
> sage: int(h)
>
> 3791862310265926082868235028028848611706634562188571520717816257498752565976400597161607168L
>
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