If/then loop help

Python
1

Hey there! I am currently working on an assignment that I got to work as per instructions, but I wanted to modify the program to have another feature that I used in a previous assignment.

My assignment wants me to build a program that reads in a year and outputs the value of the targeted car for that specific year.

My finished code that does work is:

The program works as it’s supposed to, but if a user inputs a year < 1962, the program just ends. I would like it to work similar to this:

where the program asks for a valid input <= 1962.

Thanks!

2

If you are asking what I think you are asking then you could do something like this:

# Ask for user input and assign to year variable

while year < 1962:
    year = int(input("Please enter a valid year:  "))

# If else tree starting with if 1962 <= year <= 1964

If the year the user puts in is 1962 or greater the while loop won’t run at all and it will just go to the if else.

3

Yeah, that will work. You’d need to initialize the value of year beforethe loop in this case though.

4

I tried the submitted code and I got a syntax error were *if 1962 <= year <= 1964.

While I was waiting for a reply, I worked out this:

while True:
  year = int(input("Enter car year:\n"))
  if year < 1962:
    print("Car was not manufactured before 1962")
    continue
  elif year >= 1962:
    print("Great year!")
    break
  elif year <= 1964:
    print("$", 18500)
  elif year <= 1968:
    print("$", 6000)
  elif year <= 1971:
    print("$", 12000)
  elif year <= 1975:
    print("$", 48000)
  elif year <= 1980:
    print("$", 200000)
  elif year <= 1985:
    print("$", 650000)
  elif year <= 2012:
    print("$", 35000000)
  elif year <= 2014:
    print("$", 52000000)

The program loops if the input is the wrong year, but if the right year is input, the program only prints “Gear year!” and stops.

Ideas?

5

This condition covers a lot of years

6

This will give you something to think about.

car_values = {"1962" : "Great year!" , "1964" : 18500 , '1968' : 6000 , 
              '1971' : 12000 , '1975' : 48000 , '1980' : 200000 , '1985' : 650000 , 
              '2012' : 35000000 , '2014' : 52000000  }
                                                                                        
                                                                                           
vehicle_years = {'low' : min(car_values.keys()),
                 'high' : max(car_values.keys()), 
                 'sorted' : sorted(car_values.keys())}
                                                                                        
year = 0                                                                                   
message_flag = 0                                                                           
while not(message_flag):                                                                   
    year = input("Enter car year:\n")                                                      
                                                                                           
    if not(year.isdigit()):                                                                
        print("Please try again.")                                                         
    else:                                                                                  
        if int(vehicle_years['low']) <= int(year) <= int(vehicle_years['high']):           
            for val_range in vehicle_years['sorted']:                                      
                if int(val_range) >= int(year):                                            
                    if int(val_range) < 1965:                                              
                        print(car_values['1962']) #TODO: Fix magic numbers                 
                        print(car_values['1964'])                                          
                    else:                                                                  
                        print(car_values[val_range])                                       
                    message_flag = 1                                                       
                    break                                                                  
        else:                                                                              
            print("Enter a value between the years {}-{}".format(vehicle_years['low'],     
                                                                 vehicle_years['high']))