What’s New In Python 3.6(docs.python.org)

    def make_dicts():
        res = []
        for i in range(1000000):
            res.append({'x': i, 'y': i})
        return res

    def make_tuples():
        templ = namedtuple('Point', ('x', 'y'))
        res = []
        for i in range(1000000):
            res.append(templ(i, i))
        return res

    from ipython_memory_usage import ipython_memory_usage as imu
    imu.start_watching_memory()
    used 0.2305 MiB RAM in 4.00s, peaked 0.00 MiB above current, total RAM usage 86.41 MiB

    %time tuples = make_tuples()
    CPU times: user 780 ms, sys: 32 ms, total: 812 ms
    Wall time: 816 ms
    used 109.0625 MiB RAM in 0.92s, peaked 0.00 MiB above current, total RAM usage 195.47 MiB

    %time dicts = make_dicts()
    CPU times: user 160 ms, sys: 32 ms, total: 192 ms
    Wall time: 194 ms
    used 99.5117 MiB RAM in 0.30s, peaked 0.00 MiB above current, total RAM usage 524.33 MiB

  >>> import collections
  >>> import sys
  >>> class A:
  ...     def __init__(self, x, y):
  ...         self.x = x
  ...         self.y = y
  ... 
  >>> class B:
  ...     __slots__ = ('x', 'y')
  ...     def __init__(self, x, y):
  ...         self.x = x
  ...         self.y = y
  ... 
  >>> C = collections.namedtuple('C', ('x', 'y'))
  >>> a = A(1, 1)
  >>> b = B(1, 1)
  >>> c = C(1, 1)
  >>> d = {'x': 1, 'y': 1}
  >>> sys.getsizeof(a) + sys.getsizeof(a.__dict__) # Plain object
  344
  >>> sys.getsizeof(b) + sys.getsizeof(b.__slots__) # Plain object with slots
  120
  >>> sys.getsizeof(c) # Named Tuple
  64
  >>> sys.getsizeof(d) # Dict
  288