[Zope] Calling an python method from within a python method

Zopesters, Does anyone know if it is possible to call an internal python method (built with the Python Method object) from within an internal python method (also built with the Python Method object)? For example: I have an internal python method called convertDate built with the Python Method object. Inside this method I would like to call another internal python method called isLeapYear(). Can this be done, if so how? Thanks, DR