Re: [pyxb-users] PluralBinding class cannot be treated like a list anymore?

[Peter B. <bi...@ac...>]

_PluralBinding was added in PyXB 1.2.1 to resolve:
https://sourceforge.net/apps/trac/pyxb/ticket/69

Using a list for elements with multiplicity greater than one bypassed
PyXB's ability to validate when the containing element added new content.
A more informed container was necessary.

A _PluralBinding instance should support all the methods of a Python list
including treating them as iterators, but it doesn't have __add__.  I could
add that method, but it would only work for pb+list, not for list+pb, so
it'd be fragile.

Best solution is to refactor your code.

Peter


On Tue, Feb 18, 2014 at 9:32 AM, Patrick Byrne <pjl...@gm...> wrote:

> Hi,
>
> I am attempting to upgrade our system from Pytbon2.6/PyXB-1.1.4 to
> Python-2.7.4/PyXB-1.2.3. I am seeing a number of errors with our scripts
> where a PluralBinding class is treated like a list.
>
> Eg1:
> this code
>     for MuxInput in If.sdr_mux_input + ["default"]:
> gives:
> TypeError: unsupported operand type(s) for +: '_PluralBinding' and 'list'
>
> Eg2:
> this code:
>     SdrIfs         = Die.sdr_interface
>     MuxedSdrIfs    = Die.muxed_sdr_interface
>     DdrIfs         = Die.ddr_interface
>     for If in SdrIfs + MuxedSdrIfs + DdrIfs:
> gives:
> TypeError: unsupported operand type(s) for +: '_PluralBinding' and
> '_PluralBinding'
>
> Can someone enlighten me as to what is going on here? I see that the
> _PluralBinding class is trying to behave like a list. It does not appear to
> be present at all in content.py in PyXB-1.1.4.
>
> Thanks.
>
> --
> Patrick Byrne
>
>
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