Classes and Data Model

Using namespace classes

This classes allow you directly assign params to class

from types import SimpleNamespace
class S(SimpleNamespace):
    pass

s = S(some='some', value='42')
print(s.some)
# out: 'some'
print(s.value)
# out: '42'

can be replaced such way:

class adict(dict):
    def __init__(self, *av, **kav):
        dict.__init__(self, *av, **kav)
        self.__dict__ = self

Slots Usage

>>> class Point:
...     __slots__ = ('x', 'y')
...
>>> p = Point()
>>> p.x = 1
>>> p.y = 2
>>> p.z = 33
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'Point' object has no attribute 'z'

TODO: add singleton, metaclasses examples