new_contents: """ Container data types """
  
  import collections
  
  """
  Defaultdict()
  
  Unlike dict, with defaultdict you do not need to check
  whether a key is present or not
  """
  sentence = "the quick brown fox jumps over the lazy dog."
  words = sentence.split(' ')
  
  d = collections.defaultdict(int)
  for word in words:
      d[word] += 1
  
  print(d)
  
  
  """
  OrderedDict()
  
  OrderedDict keeps its entries sorted as
  they are initially inserted.
  """
  alphabets = collections.OrderedDict([("A", 65), ("D", 68), ("X", 88)])
  for key, value in alphabets.items():
      print(key, value)
  
  
  """
  Counter()
  
  A counter stores elements as dictionary keys,
  and their counts are stored as dictionary values
  """
  colors = ['blue', 'black', 'green', 'blue', 'pink', 'black',
            'green', 'white', 'black', 'white', 'pink', 'green', 'black']
  print(collections.Counter(colors))
  
  
  """
  Namedtuple()
  
  Namedtuple() creates tuple-like objects
  that have fields accessible by attribute lookup
  as well as being indexable and iterable
  """
  student = collections.namedtuple('Student', ['first', 'last', 'grade'])
  student_1 = student('Harry', 'Potter', 'A')
  print(student_1.first)
  print(student_1.grade)
  
subject: Add collections module