Updated test for Python 3
Updated test for Python 3

pgmpy/pgmpy,ankurankan/pgmpy,kris-singh/pgmpy,abinashpanda/pgmpy,pgmpy/pgmpy,liquidmetal/pgmpy,abinashpanda/pgmpy,sandeepkrjha/pgmpy,jhonatanoliveira/pgmpy,jhonatanoliveira/pgmpy,kris-singh/pgmpy,khalibartan/pgmpy,sandeepkrjha/pgmpy,anaviltripathi/pgmpy,liquidmetal/pgmpy,khalibartan/pgmpy,ankurankan/pgmpy,anaviltripathi/pgmpy