Arithmetic Formatter (weird issue)

Python
1

Tell us what’s happening:
Hi everyone!
My code is done but somehow the unit test complains with the following error:

AssertionError: Expected different output when calling "arithmetic_arranger()" with ["3801 - 2", "123 + 49"]
E       assert '  3801      ...    -----    ' == '  3801      ...----    -----'
E             3801      123
E           -    2    +  49
E         - ------    -----
E         + ------    -----    
E         ?                ++++

Which is really weird because I am not printing anywhere plus signs or question marks, and I’m sure not printing 2 rows of dashes (as you will later see in the code).
Even weirder is that when I pass the final string with raw \n, and i compare the output with the expected_output, they are identical!! I even checked it using an online diff tool.
So I would really appreciate any advice here.
Thanks in advance.

Your code so far

def arithmetic_arranger(problems, show=False):

  ##############
  #problems validation
  valid_chars = ["1","2","3","4","5","6","7","8","9","0","+","-"," "]
  #first case
  if len(problems) > 5:
    return "Error: Too many problems."
  #second case
  for problem in problems:
    if "/" in problem or "*" in problem:
      return "Error: Operator must be '+' or '-'."
  #third case
  for problem in problems:
    for char in problem:
      if char not in valid_chars:
        return "Error: Numbers must only contain digits."
  #4th case
  for problem in problems:
    elements = problem.split()
    if len(elements[0]) > 4 or len(elements[-1]) > 4:
      return "Error: Numbers cannot be more than four digits."
  ##############

  space = "    "
  processed_problems = []
  arranged_problems = ""
  first_column = ""
  second_column = ""
  third_column = ""
  fourth_column = ""

  for problem in problems:
    processed_problems.append(problem.split())

  for problem in processed_problems:
    int_problem = []
    int_problem.append(int(problem[0]))
    int_problem.append(int(problem[-1]))
    l = len(str(max(int_problem))) + 2
    first_column += ( problem[0].rjust(l) + space ) 
    second_column += ( problem[1] +  problem[2].rjust(l - 1) + space )
    third_column += ( "-" * l + space )
    if show:
      if problem[1] == "+":
        result = str(int(problem[0]) + int(problem[-1]))
      else:
        result = str(int(problem[0]) - int(problem[-1]))
      fourth_column += ( result.rjust(l) + space)
  
  first_column = first_column.rstrip() + "\n"
  second_column = second_column.rstrip() + "\n"
  if show:
    third_column = third_column.rstrip() + "\n"
  fourth_column = fourth_column.rstrip()

  arranged_problems = first_column + second_column + third_column + fourth_column

  return arranged_problems

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Challenge: Arithmetic Formatter

Link to the challenge:

2

The - indicates how the line should be and the + indicates what your code actually provided.

It looks like you have extra spaces at the end of this line.

3

Thank you so much for the quick reply!

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