2011/6/19 Vinay Sajip <report@bugs.python.org>:
>
> Vinay Sajip <vinay_sajip@yahoo.co.uk> added the comment:
>
> This seems a bit hacky, and I'm not sure how reliable it is. I added this after the read_object call:
>
>    if (is_file) {
>        PyObject * newpos;
>        int cp, np;
>
>        cp = ftell(rf.fp);
>        newpos = PyObject_CallMethod(f, "seek", "ii", cp, SEEK_SET);

Why not 0?

>        assert(newpos != NULL);
>        np = PyLong_AsLong(newpos);
>        Py_DECREF(newpos);
>        assert(cp == np);
>    }
>
> When I run the code lots of times, I sometimes get assertion failures at the
>
> assert(newpos != NULL)

That's because the call is failing. Why?

>
> line. It's not an EOF condition thing, necessarily: I do get expected behaviour at least sometimes when seeking to the end of file.
>