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Calculate length of selected features in PyQGIS

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0

I create a selection with getFeatures(QgsFeatureRequest()) and I want to calculate the length of the result which is a QgsFeatureIterator :

select = QgsExpression(" myexpression ")

selectedfeats = layer.getFeatures(QgsFeatureRequest(select ))



total = 0

for feature in selectedfeats :

    geom = feature.geometry()

    total += geom.length()

But it doesn't work it returns 0 whereas the selectedfeats is not empty.

pyqgis geometry qgis-3 expression length

share

edited 3 mins ago

Vince

14.6k32748

asked 7 mins ago

dmjf08dmjf08

1588

add a comment | 

0

I create a selection with getFeatures(QgsFeatureRequest()) and I want to calculate the length of the result which is a QgsFeatureIterator :

select = QgsExpression(" myexpression ")

selectedfeats = layer.getFeatures(QgsFeatureRequest(select ))



total = 0

for feature in selectedfeats :

    geom = feature.geometry()

    total += geom.length()

But it doesn't work it returns 0 whereas the selectedfeats is not empty.

pyqgis geometry qgis-3 expression length

share

edited 3 mins ago

Vince

14.6k32748

asked 7 mins ago

dmjf08dmjf08

1588

add a comment | 

I create a selection with getFeatures(QgsFeatureRequest()) and I want to calculate the length of the result which is a QgsFeatureIterator :

select = QgsExpression(" myexpression ")

selectedfeats = layer.getFeatures(QgsFeatureRequest(select ))



total = 0

for feature in selectedfeats :

    geom = feature.geometry()

    total += geom.length()

But it doesn't work it returns 0 whereas the selectedfeats is not empty.

pyqgis geometry qgis-3 expression length

share

edited 3 mins ago

Vince

14.6k32748

asked 7 mins ago

dmjf08dmjf08

1588

select = QgsExpression(" myexpression ")

selectedfeats = layer.getFeatures(QgsFeatureRequest(select ))



total = 0

for feature in selectedfeats :

    geom = feature.geometry()

    total += geom.length()

share

edited 3 mins ago

Vince

14.6k32748

asked 7 mins ago

dmjf08dmjf08

1588

share

edited 3 mins ago

Vince

14.6k32748

asked 7 mins ago

dmjf08dmjf08

1588

edited 3 mins ago

Vince

14.6k32748

edited 3 mins ago

Vince

14.6k32748

asked 7 mins ago

dmjf08dmjf08

1588

asked 7 mins ago

dmjf08dmjf08

1588