**Tell us what’s happening:**

Assertion error when running code against tests. Even though when testing string outputs are the same as the expected outputs in the testing file.

**Your code so far**

```
def arithmetic_arranger(problems, *args):
#problems = (['32 - 698', '1 - 3801', '45 + 43', '123 + 49', '988 + 40'])
number1 = 0
number2 = 0
operand = ""
line1 = ""
line2 = ""
line3 = ""
line4 = ""
spaces = 0
indent = " "
sumx = 0
if len(problems) > 5:
return"Error: Too many problems."
#array split into seperate numbers and operators
for item in problems:
item = item.split()
number1 = item[0].strip(" ")
number2 = item[2].strip(" ")
operand = item[1].strip(" ")
try:
int(number1)
int(number2)
except:
return"Error: Operator must be '+' or '-'.'"
break
if len(number1) > 4 or len(number2) > 4:
return"Error: Numbers cannot be more than four digits."
break
if operand == "*" or operand == "/":
return"Error: Operator must be '+' or '-'."
break
if operand == '+':
sumx = str(int(number1) + int(number2))
elif operand == "-":
sumx = str(int(number1) - int(number2))
spaces = max(len(number1), len(number2))+2
line1 += str(number1).rjust(spaces)
line2 += str(operand + number2.rjust(spaces-1))
line3 += ('-' * spaces)
line4 += str(sumx).rjust(spaces)
if item != problems[-1]:
line1 += " "
line2 += " "
line3 += " "
line4 += " "
if args:
arranged_problems = line1 + "\n" + line2 + "\n" + line3 + "\n" + line4
else:
arranged_problems = line1 + "\n" + line2 + "\n" + line3
print(arranged_problems)
return arranged_problems
```

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**Challenge:** Scientific Computing with Python Projects - Arithmetic Formatter

**Link to the challenge:**