Possible to tack on random stuff to objects?

[Bruno Desthuilliers]

Cruxic a écrit :
> Is it possible to tack on arbitrary attributes to a python object?

Depends on the object's class. In the common case it's possible but 
there are a couple cases - mostly builtin immutable types - where it's not.

> For example:
> 
> s = 'nice 2 meet you'
> s.isFriendly = True
> 
> In the above example Python complains on the second line with:
> 
> AttributeError: 'str' object has no attribute 'isFriendly'
> 
> Is there another way?

 >>> class MyString(str): pass
...
 >>> s = MyString("hello")
 >>> s.is_friendly = True
 >>> s
'hello'
 >>>