Build an Arithmetic Formatter Project - Build an Arithmetic Formatter Project

Python
1

Tell us what’s happening:

Unable to understand why my code is unable to pass the tests. I have manually tried out the tests on my code and the output seems to be the same as the test answers. Could any kind soul enlighten me on what’s wrong?

Your code so far

def arithmetic_arranger(problems, show_answers=False):
    r1, r2, r3, r4 = '', '', '', ''
    
    if len(problems) > 5:
        print('Error: Too many problems.')
        return None

    for prob in problems:
        num = prob.strip().split()
        aoperand, operator, boperand = num[0], num[1], num[2]

        if operator != '+' and operator != '-':
            print("Error: Operator must be '+' or '-'.")
            return None

        if aoperand.isdigit() == False or boperand.isdigit() == False:
            print('Error: Numbers must only contain digits.')
            return None

        if len(aoperand) > 4 or len(boperand) > 4:
            print('Error: Numbers cannot be more than four digits.')
            return None

        if len(aoperand) > len(boperand):
            width = len(aoperand) + 2
        else:
            width = len(boperand) + 2
        
        if operator == '+' :
            answer = str(int(aoperand) + int(boperand))
        elif operator == '-' :
            answer = str(int(aoperand) - int(boperand))
        else :
            pass 

        r1space = ' ' * (width - len(aoperand))
        r2space = ' ' * (width - len(boperand) - len(operator))
        r4space = ' ' * (width - len(answer))

        r1 += r1space + aoperand + (' ' * 4)
        r2 += operator + r2space + boperand + (' ' * 4)
        r3 += (width * '-') + (' ' * 4)
        r4 += r4space + answer + (' ' * 4)

    if show_answers == True :
        problems = f'{r1}\n{r2}\n{r3}\n{r4}'.rstrip()
    else :
        problems = f'{r1}\n{r2}\n{r3}'.rstrip()
    
    return problems

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Challenge Information:

Build an Arithmetic Formatter Project - Build an Arithmetic Formatter Project

2

what is printed to the console, yes, but the output? Each test says “should return”, what does your function return for the failed test cases?

for example, what is returned for the function in this test?

  1. arithmetic_arranger(["24 + 85215", "3801 - 2", "45 + 43", "123 + 49"]) should return 'Error: Numbers cannot be more than four digits.' .
3

I understand the mistake for the errors now. Thank you for the help! As for the rest of the tests, I realised I only stripped off the whitespace on the final row of each printed output. Since whitespaces are considered ‘invisible’, I did not notice my mistake until I stared hard enough at the code. Glad to be able to solve the mistakes!