Hi All,

My code is running ok and passes all the tests when i run them manually but fails with the test module.

Any advice or pointers as to why?

def arithmetic_arranger(problems):

```
arranged_problems=0
arranged_problems=[]
## Length test
if len(problems)>5:
print("Error: Too many problems.")
else:
for i in problems:
x=i.split()
n1=(x[0])
symbol= x[1]
n2=(x[2])
## operator test
if symbol == "*" or symbol == "/":
print("Error: Operator must be '+' or '-'.")
else:
fstlength=len(n1)
sndlength=len(n2)
## len test
if fstlength>4 or sndlength>4:
print("Error: Numbers cannot be more than four digits.")
break
else:
## digit test
if n1.isalpha() or n2.isalpha() == False:
pass
else:
print("Error: Numbers must only contain digits.")
n1=int(n1)
n2=int(n2)
## calculation
if symbol == "+":
answer = n1+n2
else:
answer= n1-n2
## display
dashsize=0
if fstlength<sndlength:
dashsize=sndlength+2
else:
dashsize = fstlength+2
dashes=str("-"*dashsize)
n3=str(n1)
n4=str(n2)
final=str(answer)
line1=str(n3.rjust(dashsize))
line2=str(symbol)+str(n4.rjust(dashsize-1))
line3=dashes
line4=str(final.rjust(dashsize))
##print("\nXXXXXX\n "+ x+" \nXXXXXXX\n")
arranged_problems.append(line1)
arranged_problems.append(line2)
arranged_problems.append(line3)
arranged_problems.append(line4)
top =str(arranged_problems[0]+" "+arranged_problems[4]+" "+arranged_problems[8]+" "+arranged_problems[12]+"\n")
bot =str(arranged_problems[1]+" "+arranged_problems[5]+" "+arranged_problems[9]+" "+arranged_problems[13]+"\n")
das =str(arranged_problems[2]+" "+arranged_problems[6]+" "+arranged_problems[10]+" "+arranged_problems[14]+"\n")
ans =str(arranged_problems[3]+" "+arranged_problems[7]+" "+arranged_problems[11]+" "+arranged_problems[15]+"\n")
arranged_problems=top+bot+das+ans
return arranged_problems
```

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**Challenge:** Arithmetic Formatter

**Link to the challenge:**