class Vehicle:
    '''
    The class blueprint for creating Vehicle objects.
    '''

    def __init__(self, make, color, passengers, wheels=4, tank=20):
        ''' Create a new Vehicle Object
            make: string representing make of the vehicle
            color: string
            passengers: int for max number of passengers.
        '''
        self.model, self.color, self.wheels = make, color, wheels
        self.seats = passengers
        self.gas = 0
        self.tank = tank
        
    def fill_tank(self, gallons):
        '''Add gallons to tank. Until it is full'''
        self.gas += gallons
        if self.gas > self.tank:
            print 'The gas tank is full!'
            self.gas = self.tank
        else:
            print 'The gas tank needs', self.tank - self.gas, 'more gallons'
                
    def __str__(self):
        '''Magic method to represent a Vehicle as a string'''
        return 'Gas remaining: ' + str(self.gas)

    def __hash__(self):
        ''' Magic method to make a vehicle hashable '''
        return hash(self.model) + hash(self.color) + hash(self.seats) + \
            hash(self.wheels) + hash(self.tank) + hash(self.gas)


if __name__ == '__main__':
     my_car = Vehicle('Honda', 'White', 4)
     your_motorcycle = Vehicle('Mazda', 'Red', 2, 2)
     semi = Vehicle('Mercedes', 'Black', 2, wheels=16)
          
     print my_car
     print your_motorcycle
     print semi

     my_car.fill_tank(15)
     your_motorcycle.fill_tank(30)