setattr too promiscuous?

[Alex]

Would it be sensible to amend setattr so that it only permitted
assignment to attribute names that can be used with the
<var_name>.<attr_name> construction without causing a syntax error?  The
possibility of doing this took me by suprise a bit:

>>> class A: pass
... 
>>> setattr(A, '/', 'test')
>>> dir(A)
['/', '__doc__', '__module__']
>>> print A./
  File "<stdin>", line 1
    print A./
            ^
SyntaxError: invalid syntax
>>> 

I guess such a patch would break existing code, but maybe extra argument
checking in setattr it could be turned on by the "import __future__"
command. 

If people think this is a good idea, I'll submit a patch at some point.

Alex.