高级编程技术 hw week5

#9-2
class Restaurant():
    def __init__(self,restaurant_name,cuisine_type,number_served=0):
        self.restaurant_name=restaurant_name
        self.cuisine_type=cuisine_type
        self.number_served=number_served
    def describe_restaurant(self):
        print("The restaurant's name is "+self.restaurant_name+'.')
        print("The restaurant's cuisine type is "+self.cuisine_type+'.')
    def open_restaurant(self):
        print("The restaurant is open.")
    def set_number_served(self,num):
        self.number_served=num
    def increment_number_served(self,num):
        self.number_served+=num

restaurant_1=Restaurant("Costa","coffee")
restaurant_2=Restaurant("BreadTalk","bread")
restaurant_3=Restaurant("Pizzahot","pizza")
restaurant_1.describe_restaurant()
restaurant_1.open_restaurant()
restaurant_2.describe_restaurant()
restaurant_3.describe_restaurant()
print('')

#9-4
restaurant=Restaurant("restaurant","Chinese food",100)
print(restaurant.number_served)
restaurant.set_number_served(200)
restaurant.increment_number_served(50)
print('')

#9-6
class IceCreamStand(Restaurant):
    def __init__(self,restaurant_name,cuisine_type,number_served=0):
        super().__init__(restaurant_name,cuisine_type,number_served=0)
        self.flavors=['Vanilla','Chocolate','Strawberry']
    def show_flavors(self):
        print(self.flavors)
icecreamStand=IceCreamStand('DQ','IceCream',2000)
icecreamStand.show_flavors()
print('')

#10-1
with open('py.txt') as file_object:
    contents=file_object.read()
    print(contents)
    for obj in file_object:
        print(obj.rstrip())
    lines=file_object.readlines()
for line in lines:
    print(line.rstrip())

#10-4
filename='guest.txt'
with open(filename,'w') as file_object:
    print("Please enter three guests' names:(Enter 'quit' to stop)") 
    name=input()
    while name!='quit':
        print("Hello, "+name+'!')
        file_object.write(name)
        name=input()
print('')

#10-6
print("Enter two numbers and I will add them.(Enter 'quit' to stop)")
while True:
    first_number=input("\nThe first number is: ")
    if first_number=='quit':
        break
    try:
        int(first_number)
    except ValueError:
        print("Sorry, you have to enter a number.")
        continue
    second_number=input("\nThe second number is: ")
    if second_number=='quit':
        break
    try:
        int(second_number)
    except ValueError:
        print("Sorry, you have to enter a number.")
        continue
    print(int(first_number)+int(second_number))
print('')

#10-11
import json
num=input("Please input your favorite number: ")
filename='number.json'
with open(filename,'w') as f_obj:
    json.dump(num,f_obj)
with open(filename) as f_obj:
    print("I know your favorite number! It's "+json.load(f_obj)+'.')


    

输入输出结果如下：

The restaurant's name is Costa.
The restaurant's cuisine type is coffee.
The restaurant is open.
The restaurant's name is BreadTalk.
The restaurant's cuisine type is bread.
The restaurant's name is Pizzahot.
The restaurant's cuisine type is pizza.

100

['Vanilla', 'Chocolate', 'Strawberry']

In Python you can do almost everything!
In Python you can do exactly everything!
Please enter three guests' names:(Enter 'quit' to stop)
Sally
Hello, Sally!
Mary
Hello, Mary!
Nolan
Hello, Nolan!
quit

Enter two numbers and I will add them.(Enter 'quit' to stop)

The first number is: 1

The second number is: w
Sorry, you have to enter a number.

The first number is: e
Sorry, you have to enter a number.

The first number is: 1

The second number is: 2
3

The first number is: quit

Please input your favorite number: 7
I know your favorite number! It's 7.