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The challenge here is getting the ESRI-provided version of Python and associated module s to work with non-ESRI provided modules that you gain via Anaconda. Generally speaking, when you download and install Anaconda, you will get newer versions of Python-related material (including standard modules like numpy) than what is in your ArcGIS "Python Stack," which will not work. You therefore must configure Anaconda to be compatible with the version of ArcGIS "Python stack" (10.1, 10.2, 10.3, Pro) that you have installed. The instructions here describe how to install older versions of modules into Anaconda that will work with ArcGIS.
Related topic: Calling arcpy from an external virtual Python environment
Anaconda is an open-source Python distribution that makes is possible to easily install and manage many pre-packaged third party Python modules. It is a competing fully open-source alternative to the Enthought Python Distribution (EPD).
It has some big advantages over using the Python Esri provides with ArcGIS:
The general workflow to make this happen is to: