None in string => TypeError?

[Ryan Hiebert]

On Mon, Jun 9, 2014 at 10:34 AM, Roy Smith <roy at panix.com> wrote:

> We noticed recently that:
>
> >>> None in 'foo'
>
> raises (at least in Python 2.7)
>
> TypeError: 'in <string>' requires string as left operand, not NoneType
>
> This is surprising.
>
> It's the same in 3.4, and I agree that it's surprising, at least to me
​. I don't know the story or implementation behind it, so I'll leave that
to others.​
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