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Goals

• Let Python programmers write GPF operators using CPython and its scientific extension libraries numpy, scipy, pandas, etc.
• It should be transparent to users how operators are implemented, e.g. using the native Java GPF API, using the Python API or using the stand-alone tools adapter.

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A Python extension module is a JAR file or directory which must contain a plain text file META-INF/snappy.def which lists all Python extensions contained in the module. Python extension modules are found in the following locations:

• <module-jar-file>   a module JAR file
• ${user.home}/.snap/snappy/ext/*    the directories in directory snappy/ext in the SNAP user directory
• ${snap.snappy.ext}   from the directory paths given in the special system property snap.snappy.ext

The text file snappy.def contains either empty lines, comment lines starting with the '#' character, or lines declaring a Python extension as follows:

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[<ext-rel-path>/]

<ext>.py   the Python code containing the class ExtClass  

<ext>-info.xml   contains the operator metadata such as processing parameter definitions (for GPF operators only)

Questions

Below is a list of questions to be addressed as a result of this requirements document:

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