Hi, the scipy.linalg module is shadowed by numpy.linalg > import scipy > scipy.linalg.__file__ '.../lib/python/numpy/linalg/__init__.pyc' import scipy.linalg works fine Reading http://permalink.gmane.org/gmane.comp.python.scientific.devel/4431 , I see that "del linalg" is not present in scipy/__init__.py Bart