| Re: "Unable to find a valid Python installation" error, a python__define error ? [message #93774 is a reply to message #93763] |
Fri, 14 October 2016 00:02  |
Kallisthène
Messages: 15
Registered: October 2012
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Junior Member |
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Le jeudi 13 octobre 2016 17:37:15 UTC+2, Dick Jackson a écrit :
> On Thursday, 13 October 2016 08:08:21 UTC-7, Kallisthène wrote:
>> Dear Chris,
>>
>> Thanks for updating the code, it works.
>> Unfortunately I needed to update the scipy svd function and thus tried your "recommended" solution of installing Anaconda.
>> Since Anaconda is now MKL-compiled for free it is indeed a good solution. BUT, Anaconda switched to Python 3.5 a year ago, and you still don't provide a idl_python35.dll for this new python flavor in your IDL install.
>>
>> Thus, unless I am mistaking, all users trying to install your recommended solution will always fail !
>>
>> Hope you'll find time to create one, as well as compiling IDL against MKL instead of providing third-party solution to your speed impediment.
>>
>> Best regards
>
> Hi Kallisthène,
>
> It's true that Anaconda installs Python 3.5 by default, but I've managed to get a new Anaconda (or Miniconda) installation to work by having it create another "environment" with Python 3.4, which works well with IDL 8.5.1. Use this command:
>
> conda create -n py34 python=3.4
>
> This will create a whole Python installation under ...Anaconda\envs\py34, and you'll need to make sure that environment variables are set correctly (your minutiae may vary):
>
> set PATH=C:\Anaconda\envs\py34;C:\Program Files\Exelis\IDL85\bin\bin.x86_64;%PATH%
> set PYTHONPATH=C:\Program Files\Exelis\IDL85\bin\bin.x86_64;C:\Program Files\Exelis\IDL85\lib\bridges
> set PYTHONHOME=C:\Anaconda\envs\py34
>
> That last one, PYTHONHOME, is not described in IDL docs for Windows, but I can assure you that on one installation I had, if that was not set, creating the Python() object would load the DLL, but any request to Python would crash IDL. PYTHONHOME was required. I am told by a reliable Exelis source that "you aren’t supposed to need to do that, at least on Windows with Anaconda" so perhaps in a future release that won't be needed.
>
> Cheers,
> -Dick
>
> Dick Jackson Software Consulting Inc.
> Victoria, BC, Canada --- http://www.d-jackson.com
Thank you for the information, I also tried to reverse to an older instance of Anaconda, but since I wanted to have the 0.18 scipy version in order to solve a SVD discrepancy, I simply installed WinPython 3.4 which is still maintained with up to date python library.
In this case I didn't need to set a PYTHONHOME.
Thanks again
Best
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