How to subclass datetime?

[Jane Austine]

> <posted & mailed>
> 
> Jane Austine wrote:
> 
> > Running Python 2.3a2 on win XP.
> > 
> > I'm interested in the new datetime module and I want to subclass
> > date/datetime class to modify the behaviour. However, simply
> > inheritting the classes(like "class mydate(date):" ) didn't work.
> 
> Please define "didn't work"...:
> 
> >>> import datetime
> >>> class mydate(datetime.date):
> ...   pass
> ...
> >>> xx=mydate(2003,4,14)
> >>> print xx
> 2003-04-14
> >>>
> 
> Seems to be working just fine.  What exactly isn't working for you?
> 

For example,

>>> class mydate(datetime.date):
	def abc(self):
		print "abc"

		
>>> z=mydate(2003,4,14)
>>> z.abc()
Traceback (most recent call last):
  File "<pyshell#6>", line 1, in -toplevel-
    z.abc()
AttributeError: 'datetime.date' object has no attribute 'abc'
>>> type(z)
<type 'datetime.date'>
>>> z.__str__()
'2003-04-14'
>>> class mydate(datetime.date):
	def __str__(self):
		return "abc"

	
>>> z=mydate(2004,4,14)
>>> z
datetime.date(2004, 4, 14)
>>> print z
2004-04-14
>>> z.__str__()
'2004-04-14'

I reckon it is not subclassing the datetime.date class in
its proper definition of subclassing.

> 
> > Should I resort to delegation?
> 
> Maybe, but it's hard to say unless you can be more specific!
> 
> 
> Alex