After running many tests to kick the tires calling Python from COS (which worked fine) in any directory,  I encountered problems when trying to access Python libraries like Numpy from any OTHER namespace.   I saw some other posts about this but the resolution seems unclear.   When I run the test program method numpytest below in %SYS it works just fine.  If i run the Python method in any other namespace I get: 

PITT>do ##class(test.python).numpytest()
DO ##CLASS(test.python).numpytest()
^
<OBJECT DISPATCH> *python object not found

Here is the test program - i did the install with IRISPIP on pan