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From: Joshua Landau <joshua.landau.ws@gmail.com>
Date: Wed, 29 May 2013 15:05:52 +0100
Subject: Re: Fatal Python error
To: Dave Angel <davea@davea.name>
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On 29 May 2013 14:02, Dave Angel <davea@davea.name> wrote:

> On 05/29/2013 08:45 AM, Oscar Benjamin wrote:
> Joshua:  Avoid doing anything complex inside an exception handler.


Unfortunately, Ranger (the file manager in question) wraps a lot of stuff
in one big exception handler. Hence there isn't much choice. The original
wasn't actually in an infinite recursion, too, but just a recursion over a
large directory.

Is there a reason that Python 3 can't be made to work like Python 2 and
PyPy, and -if not- should it? The catchable fail would be much nicer than
just bombing the program.

In the meantime the algorithm should just be reworked, but it seems like a
larger step than should be needed.

If nothing else, the exception frame is huge.  I probably would have
> spotted it except for the indentation problem triggered by html.  The top
> level code following your function didn't have any loops, so it wasn't a
> problem.
>
> Can anyone help Joshua put his gmail into text mode?


I've found a new option. As a test, here's a simplified version without the
property:

def loop():
    try:
        (lambda: None)()
    except:
        pass

    loop()

try:
    loop()
except RuntimeError:
    pass

which is pretty much Oscar Benjamin's, but less stupid.

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<div dir=3D"ltr">On 29 May 2013 14:02, Dave Angel <span dir=3D"ltr">&lt;<a =
href=3D"mailto:davea@davea.name" target=3D"_blank">davea@davea.name</a>&gt;=
</span> wrote:<br><div class=3D"gmail_extra"><div class=3D"gmail_quote"><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-lef=
t-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padd=
ing-left:1ex">

<div class=3D""><div class=3D"h5">On 05/29/2013 08:45 AM, Oscar Benjamin wr=
ote:</div></div>
Joshua: =C2=A0Avoid doing anything complex inside an exception handler.</bl=
ockquote><div><br></div><div>Unfortunately, Ranger (the file manager in que=
stion) wraps a lot of stuff in one big exception handler. Hence there isn&#=
39;t much choice. The original wasn&#39;t actually in an infinite recursion=
, too, but just a recursion over a large directory.</div>

<div><br></div><div>Is there a reason that Python 3 can&#39;t be made to wo=
rk like Python 2 and PyPy, and -if not- should it? The catchable fail would=
 be much nicer than just bombing the program.</div><div><br></div><div>

In the meantime the algorithm should just be reworked, but it seems like a =
larger step than should be needed.</div><div><br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;borde=
r-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">

If nothing else, the exception frame is huge. =C2=A0I probably would have s=
potted it except for the indentation problem triggered by html. =C2=A0The t=
op level code following your function didn&#39;t have any loops, so it wasn=
&#39;t a problem.<br>


<br>
Can anyone help Joshua put his gmail into text mode?</blockquote><div><br><=
/div><div>I&#39;ve found a new option. As a test, here&#39;s a simplified v=
ersion without the property:</div><div><br></div><div><div>def loop():</div=
>

<div>=C2=A0 =C2=A0 try:</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 (lambda: None=
)()</div><div>=C2=A0 =C2=A0 except:</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 p=
ass</div><div><br></div><div>=C2=A0 =C2=A0 loop()</div><div><br></div><div>=
try:</div><div>=C2=A0 =C2=A0 loop()</div><div>except RuntimeError:</div><di=
v>

=C2=A0 =C2=A0 pass</div></div><div><br></div><div>which is pretty much=C2=
=A0<span style=3D"font-family:arial,sans-serif;font-size:10px">Oscar Benjam=
in&#39;s, but less stupid.</span></div><div><br></div></div></div></div>

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