[IronPython] Bug: module ImportError exception not being raised

Anthony Tarlano mailinglist.account at gmail.com
Wed Apr 12 13:28:36 CEST 2006


Dino,

I just tried to reproduce the bug here at work and like you I was
unable. The original behavior and test was done on my home PC (Windows
Home Edition), so I will have to check later and get back to you.

Anthony

On 4/12/06, Dino Viehland <dinov at exchange.microsoft.com> wrote:
> I've just got around to looking at this, and the repro isn't working for me on beta 5.  I've created a.py and b.py:
>
> a.py:
> from b import BClass
>
> class AClass:
>     pass
>
> b.py:
> from a import AClass
>
> class BClass:
>     pass
>
>
> and then I get:
>
> IronPython 1.0.2280 (Beta) on .NET 2.0.50727.32
> Copyright (c) Microsoft Corporation. All rights reserved.
> >>> import a
> Traceback (most recent call last):
>   File , line 0, in input##0
>   File , line 0, in __import__##4
>   File F:\Product\IronPython\IronPython\Experimental\a.py, line 1, in Initialize
>   File , line 0, in __import__##4
>   File F:\Product\IronPython\IronPython\Experimental\b.py, line 1, in Initialize
> ImportError: cannot import AClass from a
>
> And ditto for import b:
>
> IronPython 1.0.2291 (Beta) on .NET 2.0.50727.32
> Copyright (c) Microsoft Corporation. All rights reserved.
> >>> import b
> Traceback (most recent call last):
>   File , line 0, in input##0
>   File , line 0, in __import__##4
>   File F:\Product\IronPython\IronPython\Experimental\b.py, line 1, in Initialize
>   File , line 0, in __import__##4
>   File F:\Product\IronPython\IronPython\Experimental\a.py, line 1, in Initialize
> ImportError: cannot import BClass from b
>
>
> I'm wondering if this could be a Mono specific bug.  Could you try one thing and give me the result, start IronPythonConsole.exe w/ -X:ExceptionDetail command line option.
>
> Then after you start spinning hit Ctrl-C ?  That should give you a nice full stack trace of where we were when we were spinning, and if we're lucky we can deduce what's going on from that.
>
>
>
> Do you want to help develop Dynamic languages on CLR? (http://members.microsoft.com/careers/search/details.aspx?JobID=6D4754DE-11F0-45DF-8B78-DC1B43134038)
>
> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Anthony Tarlano
> Sent: Thursday, April 06, 2006 1:59 PM
> To: Discussion of IronPython
> Subject: [IronPython] Bug: module ImportError exception not being raised
>
> Hi,
>
> I found that IronPython Beta 5 is not raising ImportError and just
> going into a livelock loop when there is a circular import between two
> modules.
>
> Here is the test case where you'll see CPython returning an
> ImportError exception and IronPython spining
>
> DELL# ls
> a.py  b.py
> DELL# cat a.py
> from b import BClass
>
> class AClass:
>     pass
> DELL# cat b.py
> from a import AClass
>
> class BClass:
>     pass
> DELL# python a.py
> Traceback (most recent call last):
>   File "a.py", line 1, in ?
>     from b import BClass
>   File "c:\usr\home\tony\ipbug\b.py", line 1, in ?
>     from a import AClass
>   File "c:\usr\home\tony\ipbug\a.py", line 1, in ?
>     from b import BClass
> ImportError: cannot import name BClass
> DELL# IronPythonConsole a.py          <----------- This command
> livelocks and never returns
>
>
> Regards,
>
> Anthony
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