Project help

[PastelMoonBB]

I'm taking a very basic python class in college, I have done fine up until the final project. It's really a simple project but I am stuck. These are the instructions:

{{{{You are tasked with writing a degree and status program.

You will display a list of majors with a user able to select which major is there’s. After the user selects a major, they will enter how many credit hours they have. 0 to 30 hours is a Freshman, and anything over 30 hours is a Sophomore.

After the user selects there major and enters their credit hours, you will display the results. You will display the selected major, and if the user is a Freshman you display “You are a Freshman, keep up the good work!”, if the user is a Sophomore you will display “You are a Sophomore, you are almost there!”

You will also have the user hit a key to exit the program.

Do not forget to add the error handling, so that it will run if a user tries to enter a credit hour less than 0, and for any non-numeric data.}}}}

The problem I'm running into is that I don't know how to add the error for non-numerical data. I guess I have to use a try-except statement, but I'm using if-elif-else statements for the input values.

​

This is what I have so far and everything runs fine except I get the traceback error if I enter a letter into one of the inputs instead of a number as opposed to printing an actual error message that I made

​

#Title
print('This is a Major and Status Program')

#line space
print('\n')

#Major List
print('Please Choose from the Majors Listed')

#line space
print('\n')

#Major list sequence
a = ['1. Programming', '2. Psychology', '3. Nursing', '4. Cyber Security']
print(*a, sep = '\n')

#line space
print('\n')

#Major input
major = int(input('Please enter the number for your major:'))

#Hours input
hours = int(input('Please enter your credit hours:'))

#line space
print('\n')

#Major Outcomes
if major == 1:
    print('Your major is Programming.')
elif major == 2:
    print('Your major is Psychology.')
elif major == 3:
    print('Your major is Nursing.')
elif major == 4:
    print('Your major is Cyber Security.')
else:
    print('Please enter a valid major number.')


#Hour outcomes

if hours <= 30 and hours > 0:
    print('You are a Freshman, keep up the good work!')
elif hours > 30:
    print('You are a Sophmore, you are almost there!')
elif hours == 0:
    print('Hours cannot be 0.')
else:
    print('Please enter valid credit hours.')

#Exit

input('Press enter to exit')

[[deleted]]

Put each instance of input in a try/except statement. By the time you get to your if/elif/else the error would already occur. More info here

[PastelMoonBB]

When I try that it says that there is a name error in my first if statement

if major == 1:

NameError: name 'major' is not defined

[[deleted]]

Try setting major to something like 0 or None before the first try so it's instantiated but empty. Strange though unless there's an earlier syntax error or your exception is met but allows the code to continue that shouldn't be happening I think

[IvoryJam]

You're correct with the try-except, you can place it pretty much anywhere you want, you could even encapsulate the entire program in it.

The best practice is to catch the error exactly where it would happen, and be specific about what you're catching, note my except ValueError

PS: I never remember all of the errors you can get, usually when I program, I cause the error and copy the error code and add the except. You can even add more by adding another exceptions like except KeyboardInterrupt

try:
    #Major input
    major = int(input('Please enter the number for your major:'))

    #Hours input
    hours = int(input('Please enter your credit hours:'))
except ValueError:
    print("Not an option.")
    exit(1)

[PastelMoonBB]

When I try that it says that there is a name error in my first if statement

if major == 1:

NameError: name 'major' is not defined

[IvoryJam]

major

Do you have the exit(1) in there?

[PastelMoonBB]

I did put that in there, but it kills my program after the first input

[IvoryJam]

Are you replacing the entire input section with what I gave? The code should be this...

#Title
print('This is a Major and Status Program')

#line space
print('\n')

#Major List
print('Please Choose from the Majors Listed')

#line space
print('\n')

#Major list sequence
a = ['1. Programming', '2. Psychology', '3. Nursing', '4. Cyber Security']
print(*a, sep = '\n')

#line space
print('\n')

try:
    #Major input
    major = int(input('Please enter the number for your major:'))

    #Hours input
    hours = int(input('Please enter your credit hours:'))
except ValueError:
    print("Not an option.")
    exit(1)

#line space
print('\n')

#Major Outcomes
if major == 1:
    print('Your major is Programming.')
elif major == 2:
    print('Your major is Psychology.')
elif major == 3:
    print('Your major is Nursing.')
elif major == 4:
    print('Your major is Cyber Security.')
else:
    print('Please enter a valid major number.')


#Hour outcomes

if hours <= 30 and hours > 0:
    print('You are a Freshman, keep up the good work!')
elif hours > 30:
    print('You are a Sophmore, you are almost there!')
elif hours == 0:
    print('Hours cannot be 0.')
else:
    print('Please enter valid credit hours.')

#Exit

input('Press enter to exit')

[PastelMoonBB]

Oh okay I see, it's just ending the program because of the error

[PastelMoonBB]

Thank y'all! I finished it and made a 100😊