Problem: new type in Python 2.2

Michael Hudson mwh at
Tue Jan 15 09:48:25 EST 2002

Dave Kuhlman <dkuhlman at> writes:

> I've implemented a new Python type (in C). It's based on
> Objects/xxobject.c in the source code distribution.  It implements
> a wrapper for a compiled XSLT stylesheet and is part of the Python
> support for libxslt.  (See
> It no longer works with Python 2.2.
> Here is the finger-print of the error:
>     o
>     o
>     o
>   File "", line 28, in translate
>       for stem in fileStems:
> TypeError: argument 2 must be string, not libxslt_stylesheet

Hmph.  I doubt that traceback is right.

Can you post some code?  Python or C, but lets go for Python first.

> Where:
>     libxslt_stylesheet is the Python type that I have implemented.
>     fileStems is a list of strings.
> The error occurs when the for statement is exited, i.e. after all
> the iterations have been completed.


> This error message does not make too much sense to me.  My type is
> not referenced in the for statement.  I don't know what argument 2
> is in a for statement.  I suppose my type implemented in C is
> confusing Python.  I'm confused too;  I can't find this error
> message in the Python 2.2 source.

The error looks to me like it came from somewhere in Python/getargs.c.

> This error occurs when I run Python 2.2.  It does not occur when I
> run Python 2.1.
> If I modify my test so that it does _not_ create an instance of
> libxslt_stylesheet, then the error does not occur.

I really need to see the Python code you're running.

> I have re-compiled my C source code with Python 2.2 source
> (includes).
> Are there some steps that I must go through in order to upgrade a
> type implemented in C for Python 2.2?

Don't think so; there are steps you *can* go through to enable
subclassing and stuff, but they're not mandatory.

Lets see some code!


  $ head -n 2 src/bash/bash-2.04/unwind_prot.c
   /* I can't stand it anymore!  Please can't we just write the
      whole Unix system in lisp or something? */
                                       -- spotted by Rich van der Hoff

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