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script.py

#Write your function here
def double_index(lst, index):
  list_until_index = lst[:index]
  print(list_until_index)
  list_after_index = lst[-index+1:]
  print(list_after_index)
  number_in_question = lst[index]
  double_number_in_question = 2 * number_in_question
  new_list = list(zip(list_until_index, [double_number_in_question], list_after_index)) 
  if len(lst) > index:
    return new_list
  else:
  	return lst

#Uncomment the line below when your function is done
print(double_index([3, 8, -10, 12], 2))