class Road(object):						# supply 'object' for class that will be inherited
	def __init__(self, name, lanes):	# 'parent' class constructor
		self.name = name
		self.lanes = lanes

class Interstate(Road):					# Interstate inherits from Road
	def __init__(self, name, lanes, toll):	# Child class constructor (Interstate)
		self.toll = toll					# toll is part of child class
		super(Interstate, self).__init__(name, lanes)	# call parent constructor for name and lanes

mainSt = Road("Main St.", 3)			# construct an object of the parent class
print mainSt.name, mainSt.lanes
I90 = Interstate('NY Thruway', 6, True)	# construct an object of the child class
print I90.name + " has " + str(I90.lanes) + ' lanes and toll == ' + str(I90.toll)