tjreedy at udel.edu
Fri Jan 15 23:22:42 CET 2010
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.
Terry Jan Reedy
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