> 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.
Not automatically.
> 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
>
> >
> > --
> > Steven D'Aprano
Maybe this would help:
class baseClass:
def __init__(self, name):
self.name=name
print 'type'+self.name+' init'
def fromfile(self, str):
if (str == 'A'):
a = typeA()
else:
a = typeB()
def getName(self):
print self.name
class typeA(baseClass):
def __init__(self):
baseClass.__init__(self, "A")
def fromfile(self, str=None):
print 'type'+self.name+' fromfile'
class typeB(baseClass):
def __init__(self):
baseClass.__init__(self, "B")
def fromfile(self, str=None):
print 'type'+self.name+' fromfile'
bcA = typeA()
bcA.fromfile()
bcA.getName()
bcB = typeB()
bcB.fromfile()
bc.getName()
I think you're looking at objects in an inverted way.
typeA is a kind of baseClass, and so is typeB.
not:
baseClass consists of 2 subclasses A and B.
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