I am using QGIS 3.4.4.

I am trying to zoom on a specific place of my map using PyQGIS

In order to do so I've defined the layer I wanted to get the features :

couche_parcelles = QgsProject.instance().mapLayersByName('Parcelles')[0]

Then I defined the extent of my layer in order to zoom :

ext = couche_parcelles.extent()
xmin = ext.xMinimum()
xmax = ext.xMaximum()
ymin = ext.yMinimum()
ymax = ext.yMaximum()
zoomRectangle = QgsRectangle(xmin,ymin,xmax,ymax)

Then I created the canvas in order to have a reference to my layer :

canvas = qgis.utils.iface.mapCanvas()

Then I get the Id's I need to get the zoom on the specific point I'm aiming at :

identifiants_parcelles = [x['Idu'] for x in couche_parcelles.getFeatures()]

Finally, I write the block which is supposed to make me zoom on my section :

expr = "\"Id\"=36773"
selection = QgsExpression(expr)
vecteur = couche_parcelles.getFeatures(QgsFeatureRequest(selection))
elemts = [x for x in vecteur]

It did work once without the need to specify the extent of my layer but then I've had the same error : Cannot zoom to selected feature(s): No extend could be determined

and yet I did determine my extent here so I don't understand why QGIS doesn't perform the zoom on the Id I'm giving him

1 Answer 1


This is the solution that I used:

project = QgsProject.instance()
couche_parcelles = project.mapLayersByName("(Layer's name)")[0]
canvas = qgis.utils.iface.mapCanvas()

#select according to the "cadastre" unique id called "Idu"
expr = "\"Idu\"='(number of the selection)'"
selection = QgsExpression(expr)
it = couche_parcelles.getFeatures(QgsFeatureRequest(selection))

ids = [i.id() for i in it]

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