Build an Arithmetic Formatter Project - Build an Arithmetic Formatter Project

Python
1

Tell us what’s happening:

Seems like only one code is accepted as correct. I am writing the code in Spyder/Visual Studio Code to cheach each case individually. After putting all togeteher, I can run each test case succesfully. However, while running it in the freeCodeCamp console I am getting errors in cases 5, 6, 7 and 8 for no reason. Any tip?

Your code so far

def arithmetic_arranger(problems, show_answers=False):
    if len(problems) > 5: # Checks if problems are > 5.
        raise ValueError('Error: Too many problems.')
    else:
        # List to store the different problems
        first_line = []
        second_line = []
        dash_line = []
        answer_line = []
        # Loop to analyze each problem case.
        for problem in problems:
            element1 = ''
            element2 = ''
            operator = ''
            
            # To obtain each operand and the operator.
            elements = problem.split()
            element1, operator, element2 = elements
            
            #Checks if operator is not + or -.
            if operator == '*':
                raise ValueError("Operator must be '+' or '-'.")
            elif operator == '/':
                raise ValueError("Operator must be '+' or '-'.")
            
            #Checks if operands are digits.
            if not element1.isdigit() or not element2.isdigit():
                raise ValueError('Error: Numbers must only contain digits.')
           
            #Checks if operands are greater that 4 digits.
            if len(element1) > 4 or len(element2) > 4:
                raise ValueError('Error: Numbers cannot be more than four digits.')
            
            #To determine the width.
            width = max(len(element1), len(element2)) + 2
            
            # Format each part of the equation.
            first_line.append(element1.rjust(width))
            second_line.append(operator + element2.rjust(width - 1))
            dash_line.append('-' * width)
            
            if show_answers:
                if operator == '+':
                    result = int(element1) + int(element2)
                elif operator == '-':
                    result = int(element1) - int(element2)
                answer_line.append(str(result).rjust(width))
            
        # Combine all parts into one formatted string
        arranged_problems = (
            "    ".join(first_line) + "\n" +
            "    ".join(second_line) + "\n" +
            "    ".join(dash_line)
            )
   
        if show_answers:
            arranged_problems += "\n" + "    ".join(answer_line)
    return arranged_problems


# Test the code
print(arithmetic_arranger(["32 + 698", "3801 - 2", "45 + 43", "123 + 49"],show_answers=True))

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Challenge Information:

Build an Arithmetic Formatter Project - Build an Arithmetic Formatter Project

2

Did you check F12 dev tools console for the more verbose output?

You can also test your function using repr() to see the raw string to compare to the tests.

print(repr(arithmetic_arranger(["44 + 815", "909 - 2", "45 + 43", "123 + 49", "888 + 40", "653 + 87"])))

Traceback (most recent call last):
  File "main.py", line 62, in <module>
  File "main.py", line 3, in arithmetic_arranger
ValueError: Error: Too many problems.
  1. arithmetic_arranger(["44 + 815", "909 - 2", "45 + 43", "123 + 49", "888 + 40", "653 + 87"]) should return 'Error: Too many problems.'.

So, the problem here is that your function should return a string and not raise an error.

1 Like
3

Ok, found what I was missing. Althoug in practice the user can observe the errors prompting, I was returning a variable all the time instead of the string. So using the same code I had to change the raise calls and instead, place a return call with the Error message. Holy molly. But thank you @pkdvalis, your answer helped me <3

1 Like