That it not true. An attribute that is defined in the class has it's own namespace in each object:
```python
>>> class Foo(object):
...  bar = False
...  def __init__(self):
...   self.bar = True
... 
>>> foo = Foo()
>>> foo.bar
True
>>> Foo.bar
False
```
But of course it is a style question and I can put the attribute into the ```__init__``` method if you want.