Installing Python for ArcGIS Pro
Many of you will probably have become quite familiar with executing your Python ArcGIS for Desktop geoprocessing scripts in standalone environments. Examples of this would include executing a script from an integrated development environment, such as IDLE as a scheduled task, or from an operating system prompt. By default, ArcGIS Pro does not include this capability. ArcGIS Pro does include an embedded Python editor that will allow you to execute your code in the Python window as a script tool or a geoprocessing tool. However, if you need to be able to access ArcGIS Pro functionalities from a standalone environment, you will need to download and install a Python setup file from My Esri (https://my.esri.com/#/downloads). This installer file will install Python 3.4.1 and other requirements needed by ArcGIS Pro.