Why can't I directly add attributes to any python object?

Question

I have this code:

>>> class G:
...   def __init__(self):
...     self.x = 20
...
>>> gg = G()
>>> gg.x
20
>>> gg.y = 2000         


        

Answer 1

While the question has already been answered; if anyone is interested in a workaround, here's an example --

mydate = datetime.date(2013, 3, 26)
mydate.special = 'Some special date annotation'  # doesn't work
...
class CustomDate(datetime.date):
    pass
mydate = datetime.date(2013, 3, 26)
mydate = CustomDate(mydate.year, mydate.month, mydate.day)
mydate.special = 'Some special date annotation'  # works