class Distance(object):

    def __init__(self):
        self._inches = 0

@property
def inches(self):
    return self._inches

@inches.setter
def inches(self, value):
    self._inches = value

@property
def feet(self):
    return self._inches / 12

@feet.setter
def feet(self, value):
    self._inches = value * 12
Python convention for variable naming to indicate units