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List:       pykde
Subject:    Re: [PyQt] Overriding QStandardItem with __iter__ in PyQt5
From:       triccare triccare <triccare () gmail ! com>
Date:       2016-10-25 18:38:35
Message-ID: CADtmbDCxGu--9HaTq+OS62CLe9krWkQcTP5NHA+g53rVpdv8Mw () mail ! gmail ! com
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On Tue, Oct 25, 2016 at 11:15 AM, triccare triccare <triccare@gmail.com>
wrote:

> This is quite interesting... If you add a traceback.print_stack()
> here:
>
> >     def __iter__(self):
> >         for row in range(self.rowCount()):
> >             yield self.child(row)
>
> It seems like it gets called when doing model.appendRow(li).
>
> Looking at Qt's documentation, QStandardItemModel::appendRow can be
> called with a QStandardItem, or a list of QStandardItems. I'm guessing
> since your custom class implements __iter__, it's treated like a list
> of QStandardItems (because how would PyQt know the difference
> otherwise?)
>
> Florian
>

Hmmm, if PyQt4 looked specifically for a QList or type(list), but now PyQt5
just looks for "list-like", that could be the explanation. Hard to tell
where the check would be in the interface between python and C.

Cleverness foiled by others' cleverness.

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<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Tue, Oct 25, 2016 \
at 11:15 AM, triccare triccare <span dir="ltr">&lt;<a \
href="mailto:triccare@gmail.com" target="_blank">triccare@gmail.com</a>&gt;</span> \
wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px \
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><span \
style="font-size:12.8px">This is quite interesting... If you add a \
traceback.print_stack()</span><br style="font-size:12.8px"><span \
style="font-size:12.8px">here:</span><br style="font-size:12.8px"><br \
style="font-size:12.8px"><span style="font-size:12.8px">&gt;        def \
__iter__(self):</span><br style="font-size:12.8px"><span \
style="font-size:12.8px">&gt;              for row in \
range(self.rowCount()):</span><br style="font-size:12.8px"><span \
style="font-size:12.8px">&gt;                    yield self.child(row)</span><br \
style="font-size:12.8px"><br style="font-size:12.8px"><span \
style="font-size:12.8px">It seems like it gets called when doing \
model.appendRow(li).</span><br style="font-size:12.8px"><br \
style="font-size:12.8px"><span style="font-size:12.8px">Looking at Qt&#39;s \
documentation, QStandardItemModel::appendRow can be</span><br \
style="font-size:12.8px"><span style="font-size:12.8px">called with a QStandardItem, \
or a list of QStandardItems. I&#39;m guessing</span><br \
style="font-size:12.8px"><span style="font-size:12.8px">since your custom class \
implements __iter__, it&#39;s treated like a list</span><br \
style="font-size:12.8px"><span style="font-size:12.8px">of QStandardItems (because \
how would PyQt know the difference</span><br style="font-size:12.8px"><span \
style="font-size:12.8px">otherwise?)</span><br style="font-size:12.8px"><br \
style="font-size:12.8px"><span \
style="font-size:12.8px">Florian</span></div></blockquote><div><br></div><div>Hmmm, \
if PyQt4 looked specifically for a QList or type(list), but now PyQt5 just looks for \
&quot;list-like&quot;, that could be the explanation. Hard to tell where the check \
would be in the interface between python and C.</div><div><br></div><div>Cleverness \
foiled by others&#39; cleverness.</div></div></div></div>


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