# Scientific Computing with Python Projects - Arithmetic Formatter

Tell us what’s happening:
Describe your issue in detail here.
Im stuck i dont know what is wrong with this line:
if re.search(“[/]”, problem) or re.search(“[*]”, problem):

import re

def arithmetic_arranger(problems):
#we want this
# [“32 + 698”, “3801 - 2”, “45 + 43”, “123 + 49”]

``````# to look like this
# 32         1      9999      523
#+  8    - 3801    + 9999    -  49
#----    ------    ------    -----
#40     -3800     19998      474
if(len(problems) > 5):
return "Error: Too Many Problems."

a = ""
b = ""
lin = ""
string = ""
for problem in problems:
if(re.search("[^\s0-9.+-]"), problem):
if re.search("[/]", problem) or re.search("[*]", problem):
return "Error: Operator must be '+' or '-'."
return "Error: Numbers must only contain digits."

number1 = problem.split(" ")[0]

op = problem.split(" ")[1]
number2 = problem.split(" ")[2]

if(len(number1) >= 5 or len(number2) >= 5):
return "Error: Numbers cannot be more than four digits."

sum = ""
if(op == "+"):
sum = str(int(number1) + int(number2))
elif(op == "-"):
sum = str(int(number1) - int(number2))

length = max(len(number1), len(number2)) +2
t = str(number1).rjust(length)
bot = op + str(number2).rjust(length - 1)
lin = ""
res = str(sum).rjust(length)
for s in range(length):
lin += "-"

if problem != problems[-1]:
a += t + '    '
b += bot + '    '
line += lin + '    '
add += res + '    '
else:
a += t
b += bot
line += lin

if solve :
string = a + "\n" + b + "\n" + lin + "\n" + add
else:
string = a + "\n" + b + "\n" + lin

return string
``````

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Challenge: Scientific Computing with Python Projects - Arithmetic Formatter

`````` if(re.search("[^\s0-9.+-]"), problem)