>any mapped class may define whatever __init__ method it wants.  while  
>assign_mapper provides a default __init__ method for classes, if the  class 
>already has an __init__ method then that one will be used (just  check out 
>assignmapper.py to see).

Thanks. So, to achieve initializations in business objects, I am following 
this pattern:

# base class for all business objects
class BOBase(object):
    def __init__(self, **kwargs):                # I copied this code
        for key, value in kwargs.items():     # from assignmapper.py
            setattr(self, key, value)                 #

class SampleBO(BOBase):
     def __init__(self, **kwargs):
        super(SampleBO, self).__init__(**kwargs)      # calling super's 
__init__
        #custom initializations, if any
        self.xyz = abc;
        .
        .
        .

This works. Any comments whether this is a good way, or any better way is 
recommended, will help.

Thanks
Sanjay



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