The way to python-fundamentals 3

Assignment:

1. Write a blog every week

2. Write login interface

Enter user name and password

Welcome message is displayed after successful authentication.

Lock after three misses

3. Multi-level menu

Three-level menu

You can choose to enter each submenu in turn.

New knowledge points required: list, dictionary

Data = {"fruit": {"banana": {"Origin": ["Hainan", "Maldives"], "Price": [9.929.9]}, "Apple": {"Origin": ["USA" "Shandong"], "Price": [1.2] 5.5]}, "Litchi": {"Origin": ["Taiwan", "Yunnan", "Guangxi"], "Price": [9351]},} "vegetables": {"cauliflower": {"Origin": ["Hebei", "Henan"], "Price": [257,13]}, "Tomato": {"Origin": ["Huairou", "Yanqing"] "Price": [0.5],}, "seasoning": {"Soy Sauce": {"Brand": ["Haitian", "Lu Hua", "Li Jinji"] "Price": [25.5, 35.5 [15.5]]}, "edible salt": {"Brand": ["Jiuda", "White Elephant"], "Price": [5jue 9]},} } while True: for i in data: print (I) choice = input ("choose to enter 1 > >:") if choice in data: while True: for i2 in data [choice]: print ("\ t" I2) choice2 = input ("enter b to return to the previous menu or select to enter 2 > >:") if choice2 in data [choice]: while True: for i3 in data [choice] [choice2]: Print ("\ t\ t" I3) choice3 = input ("enter b to return to the menu above or select to enter 3 > >:") if choice3 in data [choice] [choice2]: for i4 in data [choice] [choice2] [choice3]: Print ("\ t\ t" I4) choice4 = input ("enter b to return to the upper layer Or enter Q to exit > >: ") if choice4 =" b ": pass elif choice4 = =" Q ": Exit () if choice3 = = "b": break elif choice3 = = "Q": Exit () if choice2 = = "b": break elif choice2 = = "Q": exit () else: print ("input does not exist.") Break