py2exe and 64/32 bit windows

[Benjamin Kaplan]

On Apr 9, 2013 12:53 PM, "Grant Edwards" <invalid at invalid.invalid> wrote:
>
> On 2013-04-09, Ian Kelly <ian.g.kelly at gmail.com> wrote:
>
> >> My "Windows partition" currently has a 64-bit Windows 7 Ultimate
> >> installation.
> >>
> >> I'm told that the executable I generate on that machine won't run on
> >> Win7 32-bit installations.  I'm not surprised by that, but I'd like
> >> to provide 32-bit operability -- and I'm not sure how one does that.
> >>
> >>  * If I built an executable on a 32-bit windows system using py2exe,
> >>    would it be usable on a 64-bit install?
> >
> > Yes, 64-bit Windows systems will run 32-bit executables.
>
> OK, that's good to know.
>
> >>  * Is there such a thing as a "fat" Windows binary that will run on
> >>    both 32 and 64 bit systems?
> >
> > With .NET applications you can choose an AnyCPU build target that
> > will dynamically select 32-bit or 64-bit at runtime based on the host
> > OS, but there is no such feature for native applications like
> > CPython.
> >
> >>  * Or do you build separate 32 and 64 bit binaries and rely on the
> >>    installer to pick the right files?  [If Inno Setup can't do that, I
> >>    can probably get somebody else to build the installer using
> >>    something that can.]
> >
> > You could do that.  The easiest thing to do though is just to make
> > sure that your 64-bit Windows installation is using a 32-bit Python
> > installation.  py2exe doesn't really build anything; it just bundles
> > your source files up with the Python interpreter, so as long as that
> > interpreter is 32-bit the generated exes should be able to run on
> > either platform.
>
> Cool, I'll try that.
>
> Are there any drawbacks to running a 32-bit Python install on a 64-bit
> machine?
>
> Can you have both 32 and 64 bit Python installed at the same time?
>
> --
> Grant Edwards               grant.b.edwards        Yow! Is it clean in
other
>                                   at               dimensions?
>                               gmail.com
> --

There aren't any drawbacks besides the usual 32-bit limitations (the memory
limit and you can't load 64-bit libs from a 32-bit exe). You can run both
32-bit and 64-bit python side by side.
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