Scientific Computing with Python Projects - Arithmetic Formatter

Tell us what’s happening:
Describe your issue in detail here.

Your code so far

def arithmetic_arranger(problems, solve = False):
    first= ""
    second =""
    lines = ""
    sumx = ""
    string= ""
    if (len(problems) > 5):
        return print("Error: Too many problems.")
    for problem in problems:
        operator = problem.split()[1]
        op1 = problem.split()[0]
        op2 = problem.split()[2]

        if len(op1) > 4 or len(op2) > 4:
            return print("Error: Numbers cannot be more than four digits.")
        try:
            op1 = int(op1)
            op2 = int(op2)
        except:
            return print("Error: Numbers must only contain digits.")
        if operator == "+":
            sum = str(op1 + op2)
        elif operator == "-":
            sum = str(op1 - op2)
        else:
            return print("Error: Operator must be '+' or '-'")

        length=max(len(str(op1)),len(str(op2)))+2
        top= str(op1).rjust(length)
        bottom = operator+str(op2).rjust(length-1)
        line = ""
        res = sum.rjust(length)
        for l in range(length):
            line += "-"
        if problem != problems[-1]:
            first +=  top + '    '
            second += bottom + '    '
            lines += line + '    '
            sumx += res + '    '
        else:
            first += top
            second += bottom
            lines += line
            sumx += res

        if solve:
            string = first +  "\n" + second + "\n" + lines + "\n" + sumx
        else:
            string = first +  "\n" + second + "\n" + lines
    return print (string)

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Challenge: Scientific Computing with Python Projects - Arithmetic Formatter

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