1.1) Create a class to represent a 2D point in space. The initializer should accept 2 inputs -- an x and a y coordinate -- and store those values as attributes of the object.



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1.2) Add a method of the class called distance_to() that accepts another point object, and returns the Euclidean distance between the two points. Add a check to this method to make sure point2 is a Point2D object.



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1.3) Generalize the class so it can handle an arbitrary number of dimensions. hint: you can use *args to accept a variable number of arguments



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2) Write a Person class and an AddressBook class. You should be able to add and remove people from the address book by passing in Person objects. If you search for a phone number, or persons name, it should return their address.



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3) Write a class to represent a vending machine. Keep track of the prices of each item, and how much money has been put in to the machine. The following code should work when you're done:

vm = VendingMachine()
vm.restock("water", quantity=5, price=1.50)
vm.restock("iced tea", quantity=10, price=2.50)
vm.restock("soda", quantity=12, price=2.00)

vm.vend("water", 1.50)
print(vm.stock("water")) # how many waters are left

vm.vend("water", 1.25) # should fail, and return the money to the user
vm.vend("water", 1.75) # should work, and return 0.25 to the user

If the machine is out of a product, it should display a friendly message and fail to vend.



In [59]:

    
class Drink(object):
    
    def __init__(self, name, quantity=0, price=1.50):
        self.name = name  
        self.quantity = quantity
        self.price = price 
        
class VendingMachine(object):
    
    def __init__(self):
        self.ledgerbook = {}
        print("You just bought a vending machine, you should restock it!")
        
    def restock(self, name='water', quantity=5, price=1.50):
        
        if name.lower() in self.ledgerbook.keys():
            self.ledgerbook[name.lower()].quantity = self.ledgerbook[name.lower()].quantity + quantity
        else :
            tasty_bev = Drink(name, quantity=quantity, price=price)
            self.ledgerbook[tasty_bev.name.lower()] = tasty_bev
    
    def empty_item(self,name):
        if name.lower() in self.ledgerbook.keys():
            del  self.ledgerbook[name.lower()]
        else:
            print("You don't have any {} in your vending machine".format(name))
            
    def vend(self, name, money):
        if name.lower() in self.ledgerbook.keys() and self.ledgerbook[name.lower()].quantity > 0: 
            change = money-self.ledgerbook[name.lower()].price       
            if money >= self.ledgerbook[name.lower()].price:
                self.ledgerbook[name.lower()].quantity -= 1
                print("Plop-thunk! \n Here is your tasty {}!".format(name))   
                if change > 0:
                    print("and here is ${} in change".format(change))
            else :
                print("Please insert ${} more.".format(abs(change))) 
                
        else:
            print("We don't have any {}, please make an alternative selection!".format(name))
            
    def stock(self, name):
        if name.lower() in self.ledgerbook.keys() and self.ledgerbook[name.lower()].quantity > 0: 
            print("We have {} of {} in stock".format(self.ledgerbook[name.lower()].quantity, name))
            return self.ledgerbook[name.lower()].quantity
        else :
            print("We are out of {}".format(name))
            return 0



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lunchroom =  VendingMachine()









    



You just bought a vending machine, you should restock it!



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lunchroom.restock('Pepsi',5,1.00)



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print lunchroom.ledgerbook['water'].price
print lunchroom.ledgerbook['water'].quantity



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lunchroom.ledgerbook[/]









    Out[30]:





{'water': <__main__.Drink at 0x1070d3c90>}



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vm = VendingMachine()
vm.restock("water", quantity=5, price=1.50)
vm.restock("iced tea", quantity=10, price=2.50)
vm.restock("soda", quantity=12, price=2.00)

vm.vend("water", 1.50)
print(vm.stock("water")) # how many waters are left

vm.vend("water", 1.25) # should fail, and return the money to the user
vm.vend("water", 1.75) # should work, and return 0.25 to the user









    



You just bought a vending machine, you should restock it!
Plop-thunk! 
 Here is your tasty water!
We have 4 of water in stock
4
Please insert $0.25 more.
Plop-thunk! 
 Here is your tasty water!
and here is $0.25 in change



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vm.stock('Iced Tea')









    



We have 10 of Iced Tea in stock






    Out[63]:





10

plot(arange(0,10))



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import