# Arithmetic Formatter assertEqual error

Tell us what’s happening:
I don’t know what’s wrong with the code

The code

``````def arithmetic_arranger(problems, showResult = False):
one = ''
two = ''
lines = ''
third = ''
for i in problems:
if len(problems) > 5:
return "Error: Too many problems."
component = i.split(' ')
first = component[0]
op = component[1]
second = component[2]
if not first.isnumeric() or not second.isnumeric():
return "Error: Numbers must only contain digits."
if len(first) > 4 or len(second) > 4:
return "Error: Numbers cannot be more than four digits."
if op == "+" or op == "-":
if op == "+":
sum = str(int(first) + int(second))
if op == "-":
sum = str(int(first) - int(second))
else:
return "Error: Operator must be '+' or '-'."

length = max(len(first), len(second)) + 2
top = first.rjust(length)
bottom  = op + second.rjust(length - 1)
res = sum.rjust(length)
line = ''
for j in range(length):
line += '-'

if i != problems[-1]:
one += top + '    '
two += bottom + '    '
lines += line + '    '
third += res + '    '
else:
one += top
two += bottom
lines += line
third += res

if showResult:
arranged_problems = one + '\n' + two + '\n' + lines + '\n' + third
else:
arranged_problems = one + '\n' + two + '\n' + lines + '\n'
return arranged_problems
``````

Log:

``````   32      3801      45      123
+ 698    -    2    + 43    +  49
-----    ------    ----    -----

F.....
======================================================================
FAIL: test_arrangement (test_module.UnitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/runner/FatalFunctionalKeyboard/test_module.py", line 10, in test_arrangement
self.assertEqual(actual, expected, 'Expected different output when calling "arithmetic_arranger()" with ["3 + 855", "3801 - 2", "45 + 43", "123 + 49"]')
AssertionError: '    [36 chars]   -    2    + 43    +  49\n-----    ------    ----    -----\n' != '    [36 chars]   -    2    + 43    +  49\n-----    ------    ----    -----'
3      3801      45      123
+ 855    -    2    + 43    +  49
- -----    ------    ----    -----
?                                 -
+ -----    ------    ----    ----- : Expected different output when calling "arithmetic_arranger()" with ["3 + 855", "3801 - 2", "45 + 43", "123 + 49"]

----------------------------------------------------------------------
Ran 6 tests in 0.002s

FAILED (failures=1)
``````

Challenge: Arithmetic Formatter

it seems you have an extra character at the end, that’s what this part shows - the dash in the line starting with `?` shows the difference between what you have and what you should have