Hi, thanks a lot for the suggestion. Actually that is exactly what I was doing this morning before I saw your reply. It is working great so far! Some details: - I have Anaconda installed (comes with Python 3.5, 64-bit option for Windows on the downloads page) at C:/Anaconda3 - that python executable is in C:/Anaconda3/python.exe and runs python 3.5, and I can import packages for python 3.5 via typing in a console "conda install package-name" (this will go to the default anaconda environment, at the moment I only have one) - when I launch python command the way I used to (e.g. Windows icon > "python (command line)"), it shows python version 2.7.5 running (this came with ArcGIS 10.2.2), and just to confirm it's using the right libraries, if I type "import os", then "os.path", it shows where that module is: <module 'ntpath' from 'C:\Python27\ArcGISx6410.2\lib\ntpath.pyc'>, this is actually the 64-bit running - I can launch ArcMap, choose 'Python' under Geoprocessing, to open the Python window, and do as above with import os etc. (this one is actually using the 32-bit python in my case). So, all is well so far. Note that during the install of anaconda, the dialog had the two questions Sage Wall mentions, with a slight modification, in that it actually asked: "make Anaconda the default Python 3.5", and not the "default Python", so I kept this box ticked, because the anaconda Python 3.5 is the only 3.5 Python that I have installed (the others are 2.7.5). No issues so far. ~elise
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