def next_ext_unit(self):
    '\n        Function to encapsulate next_ext_unit attribute\n\n        '
    next_unit = (self._next_ext_unit + 1)
    self._next_ext_unit += 1
    return next_unit
Function to encapsulate next_ext_unit attribute
def next_ext_unit(self):
    '\n        \n\n        '
    next_unit = (self._next_ext_unit + 1)
    self._next_ext_unit += 1
    return next_unit