Specifying input/output arguments

We need to adjust the SWIG interface file: 
/* typemaps.i allows input and output pointer arguments to be
   specified using the names INPUT, OUTPUT, or INOUT */
%include "typemaps.i"

void   hw3(double r1, double r2, double *OUTPUT);
Now the usage from Python is 
s = hw3(r1, r2)
Unfortunately, SWIG does not document this in doc strings

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