I wrote:
> I personally see no way to defend ('' in 'x') returning false; it's so
> clearly a substring that any definition of substring-ness that
> excludes this seems mathematically wrong, despite your good
> intentions.
However, the backwards compatibility argument makes sense. It used to
raise an exception and it would probably break code if it stopped
doing so; longer strings are much less likely to be passed by accident
so the need for the exception there is less strong. I'm of two minds
on this now...
--Guido van Rossum (home page: http://www.python.org/~guido/)
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