d = dict(a="one", b="two")
print(d.a)
# Traceback (most recent call last):
#   File "<stdin>", line 2, in <module>
# AttributeError: 'dict' object has no attribute 'a'

class DictToDotNotation:
  def __init__(self, d):
    for k, v in d.items():
      setattr(self, k, v)

d = dict(a="one", b="two")
obj = DictToDotNotation(d)
print(obj.a)
print(obj.b)
print(obj["a"])
# one
# two
# Traceback (most recent call last):
#   File "<stdin>", line 10, in <module>
# TypeError: 'DictToDotNotation' object is not subscriptable

class DictHybrid(object):
    """
    A dict-like object used to allow both dot and array notation to access its keys.
    Accessing an undefined key using dot notation returns `None`, while using
    traditional notation `[key]` will raise a `KeyError`.
    """

    # TODO: Can add default_data here too as a ChainMap to allow for values
    # overridden by parent templates
    def __init__(self, **kwargs):
        self._dict = dict(**kwargs)

    def __getattr__(self, name):
        """Support dot notation value access"""
        return self._dict.get(name)

    def __getitem__(self, name):
        """Support dict style value access"""
        return self._dict[name]


d = DictHybrid(a="foo")
print(d.a)
print(d.b)
print(d["b"])
# foo
# None
# Traceback (most recent call last):
#   File "<stdin>", line 25, in <module>
#   File "<stdin>", line 19, in __getitem__
# KeyError: 'b'