Fill in the Blanks.py

import math
# Add any extra import statements you may need here


# Add any helper functions you may need here


def fill_in_the_blanks(input_lst):
  # Write your code here
  new_list = []
  prev = None
  
  for i in input_lst:
    if prev == None:
      new_list.append(i)
      prev = i
    elif i == None:
      new_list.append(prev)
    else:
      new_list.append(i)
      prev = i
  
  return new_list









# These are the tests we use to determine if the solution is correct.
# You can add your own at the bottom.

test_case_number = 1

def check(expected, output):
  global test_case_number
  result = False
  if expected == output:
    result = True
  rightTick = '\u2713'
  wrongTick = '\u2717'
  if result:
    print(rightTick, ' Test #', test_case_number, sep='')
  else:
    print(wrongTick, ' Test #', test_case_number, ': Expected ', expected, sep='', end='')
    print(' Your output: ', output, end='')
    print()
  test_case_number += 1

if __name__ == "__main__":

  # Testcase 1
  input_lst_1 = [1,None,2,3,None,None,5,None]
  output_1 = fill_in_the_blanks(input_lst_1)
  expected_1 = [1, 1, 2, 3, 3, 3, 5, 5]
  check(expected_1, output_1)
  

  # Testcase 2
  input_lst_2 = [None, 8, None]
  output_2 = fill_in_the_blanks(input_lst_2)
  expected_2 = [None, 8, 8]
  check(expected_2, output_2)


  # Testcase 3
  input_lst_3 = [1,None,2]
  output_3 = fill_in_the_blanks(input_lst_3)
  expected_3 = [1, 1, 2]
  check(expected_3, output_3)
  

  # Testcase 4
  input_lst_4 = [5, None, None]
  output_4 = fill_in_the_blanks(input_lst_4)
  expected_4 = [5, 5, 5]
  check(expected_4, output_4)
  
  # Add your own test cases here