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python-backcall: python-backcall (callback specification API)
python-backcall: 
python-backcall: This Python module provides a way of specifying the signature an
python-backcall: API expects from a callback function.
python-backcall: 
python-backcall: 
python-backcall: 
python-backcall: 
python-backcall: 
python-backcall: 
python-backcall: