logging from severl classes

[flupke]

Hi,

i'm trying to log to the same file (using logging module) from different 
classes but i can't seem to get it to work.
File 1 is the main file which sets up the logger and then i want to also
use the same logger in another class
This is what i have

file1
=============================
import logging

class A:
    def __init__(self):
	self.logger = logging.getLogger("app_logfile")
         ### stdout handler ###
         self.logger.setLevel(logging.DEBUG)

         stream_hld = logging.StreamHandler()
         stream_hld.setLevel(logging.DEBUG)
         stream_formatter =
		logging.Formatter('%(asctime)s %(levelname)s %(module)s 			%(lineno)d 
%(message)s ')
         stream_hld.setFormatter(stream_formatter)
         self.logger.addHandler(stream_hld)")
=============================

file2
=============================
import logging

class B:
    def __init__(self):
	self.logger = logging.getLogger("app_logfile")
         self.logger.debug("creating class B")

    def otherfunction(self):
	self.logger.debug("in otherfunction")
=============================

But i get an error:
   AttributeError: B instance has no attribute 'logger'

I was hoping that by requesting a logger with the same name 
(app_logfile) i would get the setup also and could use the logger 
straight away. Funny thing is that the use of the logger in the __init__ 
function of class B works but the call to the logger in otherfunction 
doesn't work and results in the error above.
Class B is created after class A so the logger object exists already.

Any ideas of what i'm doing wrong and how i can achieve setting up the 
logger object only once?

Thanks,
Benedict