steve at holdenweb.com
Sat Jan 16 00:09:01 CET 2010
Terry Reedy wrote:
> On 1/15/2010 3:37 PM, Sean DiZazzo wrote:
>> Should the following be legal?
>>>>> class TEST(object): pass
>>>>> t = TEST()
>>>>> setattr(t, "", "123")
>>>>> getattr(t, "")
> Different people have different opinions as to whether setattr (and
> correspondingly getattr) should be strict or permissive as to whether or
> not the 'name' string is a legal name. CPython is permissive. The
> rationale is that checking would take time and prevent possible
> legitimate use cases.
> CPython is actually looser than this. Try
> t.__dict__ = 2
> Now there is an 'attribute' whose 'name' is an int! -- and which can
> only be accessed via the same trick of delving into the internals. This
> is, however, implementation behavior that would go away if an
> implementation used string-key-only dicts to store attributes.
Good question, great answer!
Steve Holden +1 571 484 6266 +1 800 494 3119
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