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import sys

"""
Prototype for price model automata
"""

class ItemPrice(object):
	"""
	Object that models item price based on supply and demand
	Calculates price by (D/S) * constant
	"""

	def __init__(self, name, constant, demand=1.0, supply=1.0):
		self.name = name
		self.constant = constant
		self.supply = supply
		self.demand = demand

	def get_price(self):
		if self.supply == 0.0:
			return float("inf")
		else:
			return (self.demand/self.supply) * self.constant

	def __repr__(self):
		return str((self.name, self.constant, self.demand, self.supply, self.get_price()))



if __name__ == '__main__':
	print ItemPrice("apple", 1.5, 15.0, 12.0)
	print ItemPrice("pear", 1.6, 15.0, 12.0)