guess_count = 0
guess_limit = 3
secret_number = 9
while guess_count < guess_limit:
         guess = int ( input ( ‘Guess: ‘))
         guess_count += 1
         if guess ==secret_number:
             print(‘ You won ! ‘）
             break
else:
       print (‘ Sorry, you failed! ‘)

command = ""
started = False#用布尔值判断当前状态
while Ture：
         command = input (">").lower()#小写化，输入的大小写不影响
          if command == “start”：
             if started：
                 print（“Car is already started!”）
             else:
                    started = Ture
                    print("Car started...")
           elif command == "stop"
                 if not started:
                    print("Car is already stopped!")
                 print("Car stopped.")
            elif command == “help”：
                 print（‘‘‘
start - to start the car
stop - to stop the car
quit - to quit
‘‘‘）
            elif command == "quit"
                  break
            else:
                   print("Sorry I don‘t understand that!")

prices = [10, 20 ,30]
total_prices = 0
for item in prices:
     total_prices += item
print(“total_prices: ” total_prices)