nested class problem

[Stephane Ninin]

  Hello all,

I am trying to play with nested class in a script I am making,
and I am not sure I really understand how they work.
 

Here is some code:

__all__ = ["ITest"]

from exceptions import Exception

class ITest(object):

    
    def __init__(self):
        if (self.__class__ == ITest):
            raise Exception("ITest cannot be instanciated")

    def read(self,filename):
        self.__filename = filename
        
    def _getFilename(self):
        return self.__filename
    
    def make_reader():
        return _PTest()
    make_reader = staticmethod(make_reader)


    
class _PTest(ITest):

    class _PHandler(object):
        
        def __init__(self):
            super(_PHandler,self).__init__()
            #self.__map={}

        def test(self):
            pass
        
    def __init__(self):
        super(_PTest,self).__init__()


    def read(self,filename):
        super(_PTest,self).read(filename)
        print "HERE"
        print dir()
        print dir(self)
        print self.__class__
        print dir(self.__class__)
        dh = self._PHandler()
        #dh.test()

if __name__=='__main__':

    a=ITest.make_reader()
    print dir(a)
    b=a.read("")
    print b
    



I want to put class _PHandler in _Ptest,
and use _PHandler in _Ptest methods,
but anything I try doesnot work...

On this configuration, I have:
Traceback (most recent call last):
  File "./test.py", line 58, in ?
    b=a.read("")
  File "./test.py", line 51, in read
    dh = self._PHandler()
  File "./test.py", line 34, in __init__
    super(_PHandler,self).__init__()
NameError: global name '_PHandler' is not defined

and I have similar problems if I try to access _PHandler
in different ways...
Is this possible somehow ? Or what is the problem with my approach ?
I know I could just dont use nested classes.., but I'd like to try. 

   Thanks in advance. 

   Regards,






-- 
Stephane Ninin