Programa python

def arithmetic_arranger(problems, display = False):

lst = []

max_length = []

length_required = []

for i in range(len(problems)):

lst.append(problems[i].split(" "))

#Checking Conditions

if len(lst) > 5:

arranged_problems_error= "Error: Too many problems."

return arranged_problems_error

for i in range(len(lst)):

#Extra condition

if(len(lst[i]) != 3):

arranged_problems_error = "Error: Expression must only contain 2 operands and 1 operator."

return arranged_problems_error

if lst[i][1] != '+' and lst[i][1] != '-':

arranged_problems_error = "Error: Operator must be '+' or '-'."

return arranged_problems_error

try:

lst[i][0] = int(lst[i][0])

lst[i][2] = int(lst[i][2])

except:

arranged_problems_error = "Error: Numbers must only contain digits."

return arranged_problems_error

#length of the longest operand

max_length.append(max(len(str(lst[i][0])), len(str(lst[i][2]))))

length_required.append(int(max_length[i]) + 2)

if lst[i][0] > 9999 or lst[i][2] > 9999:

arranged_problems_error = "Error: Numbers cannot be more than four digits."

return arranged_problems_error

arranged_problems = ""

#first line

for i in range(len(lst)):

space_required = length_required[i] - len(str(lst[i][0]))

for j in range(space_required):

arranged_problems += " "

arranged_problems += str(lst[i][0]) + " "

arranged_problems = arranged_problems.rstrip()

arranged_problems += "\n"

#second line

for i in range(len(lst)):

arranged_problems += lst[i][1]

space_required = length_required[i] - len(str(lst[i][2])) - 1

for j in range(space_required):

arranged_problems += " "

arranged_problems += str(lst[i][2]) + " "

arranged_problems = arranged_problems.rstrip()

arranged_problems += "\n"

#dashed line

for i in range(len(lst)):

for j in range(length_required[i]):

arranged_problems += "-"

arranged_problems += " "

arranged_problems = arranged_problems.rstrip()

#Display is set to False

if(not display):

return arranged_problems

...