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Tell us what’s happening:

Test number 9 is now passing. The print ERROR states that the operator must be ’ + ’ or ’ - ’ .

I can’t seem to find the solution. Any light on what could be causing it?

Your code so far


def arithmetic_arranger(problems, show_answers=False):
    if len(problems) > 5:
        return ('Error: Too many problems.')
        

    # list of all operations in str format
    #shows error message when not '-' or '+'
    operations = list(map(lambda x: x.split()[1], problems))
    if set(operations) != {'+', '-'} and len(set(operations)) != 2:
         return ("Error: Operator must be '+' or '-'.")

    numbers = []  # list of all operands in str format
    for i in problems:
        p = i.split()
        numbers.extend([p[0], p[2]])

    if not all(map(lambda x: x.isdigit(), numbers)):
        
        return ('Error: Numbers must only contain digits.')

    if not all(map(lambda x: len(x) < 5, numbers)):
        
        return ('Error: Numbers cannot be more than four digits.')

    top_row = ''
    dashes = ''
    values = list(map(lambda x: eval(x), problems))
    solutions = ''
    for i in range(0, len(numbers), 2):
        space_width = max(len(numbers[i]), len(numbers[i+1])) + 2
        top_row += numbers[i].rjust(space_width)
        dashes += '-' * space_width
        solutions += str(values[i // 2]).rjust(space_width)
        if i != len(numbers) - 2:
            top_row += ' ' * 4
            dashes += ' ' * 4
            solutions += ' ' * 4

    bottom_row = ''
    for i in range(1, len(numbers), 2):
        space_width = max(len(numbers[i - 1]), len(numbers[i])) + 1
        bottom_row += operations[i // 2]
        bottom_row += numbers[i].rjust(space_width)
        if i != len(numbers) - 1:
            bottom_row += ' ' * 4

    if show_answers:
        problems = '\n'.join((top_row, bottom_row, dashes, solutions))
    else:
        problems = '\n'.join((top_row, bottom_row, dashes))
    return problems


print(f'\n{arithmetic_arranger(["32 + 698", "3801 - 2", "45 + 43", "123 + 49"])}')

print(f'\n{arithmetic_arranger(["3 + 855", "988 + 10"])}') #testing parameter 9 -not working regardless of operator meeting conditions. 

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Challenge Information:

Build an Arithmetic Formatter Project - Build an Arithmetic Formatter Project

Which part of code is responsible for it? Try using print to pin-point exact place where things go awry.

I wonder if the ERROR is caused by evaluating only 2 operations instead of 3 in the 9th test.
Also, is it line 11: return (“Error: Operator must be ‘+’ or ‘-’.”) where you recommend to print? any hints?

Then print what’s in the operations, what are the results of individual conditions in the relevant if, etc.

Thanks for the guidance!

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