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Date: Mon, 9 Jun 2014 10:42:08 -0500
Subject: Re: None in string => TypeError?
From: Ryan Hiebert <ryan@ryanhiebert.com>
To: Roy Smith <roy@panix.com>
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On Mon, Jun 9, 2014 at 10:34 AM, Roy Smith <roy@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
=E2=80=8B. I don't know the story or implementation behind it, so I'll leav=
e that
to others.=E2=80=8B

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif"><span style=3D"font-family:arial">On Mon, Jun 9, 2014 a=
t 10:34 AM, Roy Smith </span><span dir=3D"ltr" style=3D"font-family:arial">=
&lt;<a href=3D"mailto:roy@panix.com" target=3D"_blank">roy@panix.com</a>&gt=
;</span><span style=3D"font-family:arial"> wrote:</span><br>
</div><div class=3D"gmail_extra"><div class=3D"gmail_quote"><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;=
border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex=
">We noticed recently that:<br>

<br>
&gt;&gt;&gt; None in &#39;foo&#39;<br>
<br>
raises (at least in Python 2.7)<br>
<br>
TypeError: &#39;in &lt;string&gt;&#39; requires string as left operand, not=
 NoneType<br>
<br>
This is surprising.<br><br></blockquote><div><span style=3D"font-family:ari=
al,helvetica,sans-serif">It&#39;s the same in 3.4, and I agree that it&#39;=
s surprising, at least to me<div class=3D"gmail_default" style=3D"font-fami=
ly:arial,helvetica,sans-serif;display:inline">
=E2=80=8B. I don&#39;t know the story or implementation behind it, so I&#39=
;ll leave that to others.=E2=80=8B</div></span>=C2=A0</div></div><br></div>=
</div>

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