possible attribute-oriented class

Peter Otten __peter__ at web.de
Fri Sep 4 09:32:51 CEST 2009


Ken Newton wrote:

> class AttrClass(object):
>     """AttrClass lets you freely add attributes in nested manner"""
> 
>     def __init__(self):
>         pass
>     def __setitem__(self, key, value):
>         return self.__dict__.__setitem__(key, value)
>     def __repr__(self):
>         return "%s(%s)" % (self.__class__.__name__,
>         self.__dict__.__repr__())
>     def __str__(self):
>         ll = ['{']
>         for k,v in self.__dict__.iteritems():
>             ll.append("%s : %s" % (k, str(v)))
>         return '\n'.join(ll) + '}'
> 
> def test():
>     atr = AttrClass()
>     atr.first = 1
>     atr.second = 2
>     atr.third = 'three'
> 
>     atrsub = AttrClass()
>     atrsub.aaa = 'AAA'
>     atrsub.bbb = 'BBB'
> 
>     atr.fourth = atrsub
>     atr.fifth = 5
> 
>     print atr
>     print
>     print repr(atr)
>     print
>     print atr.fourth.aaa

Just in case you didn't note: your test() function will run successfully 
even if you remove the __setitem__() method. Allowing

atr["x"] = 42

but not

print attr["x"]

may puzzle your intended audience.






More information about the Python-list mailing list