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<div class="moz-cite-prefix">On 27. 02. 14 18:41, Michael McInnis
wrote:<br>
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<blockquote cite="mid:COL130-W10E6319490CFA67BB60AA4D9830@phx.gbl"
type="cite">
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<div dir="ltr">Desperately need help doing attribute based
selection :
<div><br>
<div><br>
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<div>How do I select all features in a LAYER that the Field
LWFLAG != 'P'</div>
<div><br>
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<div>Python Console</div>
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<p class="MsoNormal">from osgeo import ogr<o:p></o:p></p>
<p class="MsoNormal">canvas = qgis.utils.iface.mapCanvas()<o:p></o:p></p>
<p class="MsoNormal">allLayers = canvas.layers()<o:p></o:p></p>
<p class="MsoNormal">for i in allLayers: i.selectAll();
print i.name(); print
i.selectedFeatureCount()<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">for i in allLayers: i.selectAll();
print i.name(); print
i.selectedFeatureCount()<o:p></o:p></p>
<p class="MsoNormal">i.getFeatures(QgsFeatureRequest().setFilterExpression(‘
“LWFLAGS”
!= \’P\’) )</p>
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</blockquote>
this is a feature iterator [0], so you need iterate<br>
<br>
f = QgsFeature()<br>
toSelect = []<br>
while i.getFeatures(QgsFeatureRequest().setFilterExpression(‘
“LWFLAGS” != \’P\’) ).nextFeature(f):<br>
toSelect.append(f.id())<br>
i.setSelectedFeatures(toSelect)<br>
<br>
[0] <a class="moz-txt-link-freetext" href="http://qgis.org/api/classQgsFeatureIterator.html">http://qgis.org/api/classQgsFeatureIterator.html</a><br>
<br>
<blockquote cite="mid:COL130-W10E6319490CFA67BB60AA4D9830@phx.gbl"
type="cite">
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<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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style="margin-bottom:0in;margin-bottom:.0001pt"><o:p></o:p></p>
<div><span style="font-size: 12pt;">exp =
QgsExpression(‘LWFLAG <> “P” ’)</span> <br>
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