On Wed, Aug 16, 2006 at 11:07:08AM -0700, KraftDiner wrote:
[...]
> Here I tried this example and maybe this will explain the difficulties
> I'm having.
> 1) at the time the baseClass is constructed shouldn't the constructor
> of the appropriate
> type be called.
> 2) getName is doing nothing...
>
> class baseClass:
> def __init__(self):
> pass
> def fromfile(self, str):
> if (str == 'A'):
> a = typeA()
> else:
> a = typeB()
> def getName(self):
> pass
>
> class typeA(baseClass):
> def __init__(self):
> self.name='A'
> print 'typeA init'
> def fromfile(self, str=None):
> print 'typeA fromfile'
> def getName(self):
> print self.name
>
> class typeB(baseClass):
> def __init__(self):
> self.name='B'
> print 'typeB init'
> def fromfile(self, str=None):
> print 'typeB fromfile'
> def getName(self):
> print self.name
>
> bc = baseClass()
> bc.fromfile('A')
> bc.getName()
> bc.fromfile('B')
> bc.getName()
> bc.getName()
>
> log:
> typeA init
> typeB init
>
I didn't follow up this thread from the begining, but I think this is
what you want;
Python 2.4.3 (#1, Mar 31 2006, 09:09:53)
[GCC 2.95.3 20010315 (release)] on sunos5
Type "help", "copyright", "credits" or "license" for more information.
>>> class baseClass:
... @staticmethod
... def fromfile(string):
... if string == "A":
... return typeA()
... else:
... return typeB()
... def getName(self):
... print self.name
...
>>> class typeA(baseClass):
... def __init__(self):
... self.name = "A"
... print "typeA init"
...
>>> class typeB(baseClass):
... def __init__(self):
... self.name = "B"
... print "typeB init"
...
>>> a = baseClass.fromfile("A")
typeA init
>>> a.getName()
A
>>> b = baseClass.fromfile("B")
typeB init
>>> b.getName()
>>> B
>>>
--
Inyeol Lee
--
http://mail.python.org/mailman/listinfo/python-list
