The output from "pyversion" looks reasonable. You don't need to explicitly load Python. It will load when it is needed, which is the first time you access the "py" package. Have you tried the example in the documentation?
When MATLAB is started pyversion returns 0 (false) for isloaded. You may still change the version of Python while isloaded is 0 (false). See pyversion documentation. Python loads dynamically upon the first usage of the “py” package. If isloaded is 0 (false) but you believe it should be 1 (true), then see the trouble shooting documentation.
