Please help me fix my code, it is supposed to do the following listed below. I don't understand what I am missing.

The method can take 0, 1 or 2 numbers, and will return their sum (for an empty string it will return 0) for example"" or "1" or "1,2".

1. Start with the simplest test case of an empty string and move to 1 and two numbers
2. Remember to solve things as simply as possible so that you force yourself to write tests you did not think about
3. Remember to refactor after each passing test
4. Allow the Add method to handle an unknown amount of numbers
5. Calling Add with a negative number will throw an exception "negatives not allowed" - and the negative that was passed.if there are multiple negatives, show all of them in the exception message. There should be a test case that tests for the exception.
6. Numbers bigger than 1000 should be ignored, so adding 2 + 1001= 2
7. Remember that your input is one string containing 1 or more numbers separated by commas.

Here is my code:

import unittest

import os

import re

negs = []

def get_calculator(input):

symbols = [',']

replace = ''

#findall reference "The Python Standard Library. (n.d.). 7.2."

for match in re.findall(r'(//)(.*)( )', input):

(start, delim_token, end) = match

replace = f'{start}{delim_token}{end}'

symbols = []

for i in re.split(r'\[|\]',delim_token):

if i != "":

symbols.append(i)

return (symbols, replace)

def add(input):

if input == "":

return 0

(calculator, strip) = get_calculator(input)

input = input.replace(strip,'')

for d in calculator:

input = input.replace(d,',')

numbers = re.split(r' |,', input)

sum = 0

for n in numbers:

if n != '':

sum += int(n)

return sum

class StringCalculatorTests(unittest.TestCase):

def test_empty(self):

"""Empty test,"" return 0"""

actual = add('')

self.assertEqual(actual,0)

def test_1(self):

"""Test 1, "1" should return 1"""

actual = add('1')

self.assertEqual(actual, 1)

def test_1_and_2(self):

"""Test 2, "1,2" should return 3"""

actual = add('1,2')

self.assertEqual(actual, 3)

def test_1_newline_2_and_3(self):

"""Test 3, "1\ 2,3" should return 6"""

actual = add('1 2,3')

self.assertEqual(actual, 6)

def test_1_defined_semi (self):

"""Test 4, "//;\ 1;2" should return 3"""

actual = add('//; 1;2')

self.assertEqual(actual, 3)

def test_defined_multi_semi(self):

"""Test 5, "//[***]\ 1***2***3" should return 6"""

actual = add('//[***] 1***2***3')

self.assertEqual(actual, 6)

def test_defined_multi_semi(self):

"""Test 6, " //[*][%]\ 1*2%3" should return -6"""

actual = add('//[*][%] 1*2%3')

self.assertEqual(actual, -6)

if len(negs) > 0:

negStr = ','.join(str(neg) for neg in negs)

raise ValueError('negative value not allowed ' + negStr)

if __name__ == '__main__':

unittest.main()

#References

#The Python Standard Library. (n.d.). 7.2. re Regular expression operations Python v3.1.5 documentation. Retrieved from https://docs.python.org/3.1/library/re.html

#re.findall(pattern, string[, flags])

#spaulk