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Note

It is suggested to use either Python 3.5 or 3.6. For higher Python version it needs a manual build of jpy (Readme).

The easiest way to configure your Python installation for the usage SNAP-Python (snappy) interface is to do it during the installation of SNAP. Within the installer you can simply activate a checkbox and select the path to the python executable.

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But it is also not a big deal to do it later manually if you might have forgotten it or if you want to configure another Python installation for snappy. Open the command line at the bin folder of the SNAP installation directory. On Windows you can simply choose 'SNAP Command-Line' from the Start menu.
Now type

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This will generate the Python module snappy configured for the current SNAP installation and your Python interpreter <python-exe> into the .snap/snap-python
directory of the user home directory. The parameter <python-exe> must be the full path to the Python interpreter executable which you want to use with SNAP (supported versions are 2.7, 3.3 to 3.6).  If you want the snappy module to be placed somewhere else use:

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