better error message for loading 32-bit Python from 64-bit Julia

[breisfeld]

Executing

> using PyCall
> @pyimport math

within the Julia console interpreter crashes it immediately (i.e., makes the console quit and disappear immediately with no time to see any warnings or error messages).

Relevant software versions:

• OS: Windows 7
• julia: Version 0.3.8 (2015-04-30 23:40 UTC), x86_64-w64-mingw32
• PyCall: v0.8.1
• Python: Python 2.7.8 |Anaconda 2.1.0 (32-bit)| (default, Jul 2 2014, 15:13:35) [MSC v.1500 32 bit (Intel)] on win32

[ihnorton]

32-bit Python will not work with 64-bit Julia.

On Tue, May 26, 2015 at 11:18 AM, Brad Reisfeld [email protected]
wrote:

Executing

using PyCall
@pyimport math

within the Julia console interpreter crashes it immediately (i.e., makes
the console quit and disappear immediately with no time to see any warnings
or error messages).

Relevant software versions:

• OS: Windows 7
• julia: Version 0.3.8 (2015-04-30 23:40 UTC), x86_64-w64-mingw32
• PyCall: v0.8.1
• Python: Python 2.7.8 |Anaconda 2.1.0 (32-bit)| (default, Jul 2 2014,
  15:13:35) [MSC v.1500 32 bit (Intel)] on win32

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#148.

[breisfeld]

Thank you for the information.
Will 32-bit Julia work with 32-bit Python?

[stevengj]

Yes, 32-bit Julia should workd with 32-bit Python.

It would be good to give a better error message than a crash here. Ideally, this would be fixed in the Julia dlopen function.

[yuyichao]

I think this is windows specific. I override dlopen_libpython to only find the lib32 version and PyCall.jl refuses to load it (as it should).

[PallHaraldsson]

@yuyichao "I think this is windows specific." Should this be marked "up for grabs"? It seems this might be easy if not already done and overlooked to close.. [I assume reading between the lines not a problem elsewhere.]

@ihnorton "32-bit Python will not work with 64-bit Julia." I do not expect it to work and, imagine it would be a lot of work if at all possible..

[stevengj]

I still think the Julia dlopen function on Windows should be fixed to refuse to load a DLL with the wrong word size, rather than crashing, if that is still happening.