Define the body of the function read_data(filename). If filename is None, return the sentence (already defined for your), otherwise return the contents of the file (whose name is in the parameter filename). If there is any error during the opening or reading of the file, print out a warning and return sentence. If you haven't completed the lesson on Python local I/O, do so now.

Answer explained

Explanation:

The main difference between parse_text_into_words( v1 and v2) is I have used splitlines also in v1 so the escape sequence '\n' will not be present in the list of words. while in v2 only split function is used so it will have '\n' present in words list.

Code:

def read_file(fileName = None):

  try:

      File = open(fileName,"r") # opening file in read mode

      for row in File:          # for each line in File

          print(row,end="")

  except IOError:      # handling exception of file opening

      print("Could not read file:",fileName)

def parse_text_into_words_v1(text):

  list_words = []

  list_lines = text.splitlines()

  for i in list_lines:

      list_words.extend(i.split(' '))

  return list_words

def parse_text_into_words_v2(text):

  list_words = []

  list_words.extend(text.split(' '))

  return list_words

def determine_difference(a_list,b_list):

  print("first list:",a_list)

  print("second list:",b_list)

  a_set = set(a_list)

  b_set = set(b_list)

  diff = a_set - b_set

  diff = list(diff)

  print("\nDifference between 2 sets: ",diff)

if __name__ == '__main__':

  print("Reading file using function read_file() to read \"data.txt\" :")

  read_file("data.txt")

  print("\n\n")

  t = '''vhfhyh ghgggj ghchvjhvj'''

  print("\nDemonstrating implementation of parse_text_into_words_v1:")

  l = parse_text_into_words_v1(t) # calling function with text parameter

  print("list of words:")

  print(l)

  print("\nDemonstrating implementation of parse_text_into_words_v2:")

  b = parse_text_into_words_v2(t) # calling function with text parameter

  print("list of words:")

  print(b)

  print("\nDemonstrating difference between two lists")

  a_list = [1,2,3,4,5,6,7,8,9,10]

  b_list = [2,4,6,8,10]

  determine_difference(a_list,b_list) # passing two list to take difference