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Execution time while changing attribute values in PyQGIS

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1

Just want to ask if this is a normal run time when creating new attributes and writing the values of more than 30,000 features. This is for a script I'm writing.

Time to change attribute value: 0:03:44.954493

The process takes approximately 4 minutes just to execute this code

mem_layer.startEditing()

startendField = QgsField(fieldname1, QVariant.String)

durationField = QgsField(fieldname2, QVariant.String)

prov = mem_layer.dataProvider()

prov.addAttributes([startendField])

prov.addAttributes([durationField])

mem_layer.updateFields()

t0 = datetime.now()

i=0

for feat in mem_layer.getFeatures():

     #mem_layer.changeAttributeValue(feat.id(),newdatetimeIdx, 12345.67890)

     feat.setAttribute(fieldname1, startend_tbl[i])

     feat.setAttribute(fieldname2, duration_tbl[i])

     #feat[fieldname1] = startend_tbl[i]

     #feat[fieldname2] = duration_tbl[i]

     mem_layer.updateFeature(feat)

     i+=1

mem_layer.commitChanges()

t1 = datetime.now()

feedback.pushInfo('Time to change attribute value: {}'.format(str(t1-t0)))

I read somewhere that using the data provider is not the most efficient method but I don't have any idea what the other options are.

pyqgis qgis-3

share|improve this question

edited 4 mins ago

Taras

2,3113727

asked 2 hours ago

strythestrythe

737

add a comment | 

1

Just want to ask if this is a normal run time when creating new attributes and writing the values of more than 30,000 features. This is for a script I'm writing.

Time to change attribute value: 0:03:44.954493

The process takes approximately 4 minutes just to execute this code

mem_layer.startEditing()

startendField = QgsField(fieldname1, QVariant.String)

durationField = QgsField(fieldname2, QVariant.String)

prov = mem_layer.dataProvider()

prov.addAttributes([startendField])

prov.addAttributes([durationField])

mem_layer.updateFields()

t0 = datetime.now()

i=0

for feat in mem_layer.getFeatures():

     #mem_layer.changeAttributeValue(feat.id(),newdatetimeIdx, 12345.67890)

     feat.setAttribute(fieldname1, startend_tbl[i])

     feat.setAttribute(fieldname2, duration_tbl[i])

     #feat[fieldname1] = startend_tbl[i]

     #feat[fieldname2] = duration_tbl[i]

     mem_layer.updateFeature(feat)

     i+=1

mem_layer.commitChanges()

t1 = datetime.now()

feedback.pushInfo('Time to change attribute value: {}'.format(str(t1-t0)))

I read somewhere that using the data provider is not the most efficient method but I don't have any idea what the other options are.

pyqgis qgis-3

share|improve this question

edited 4 mins ago

Taras

2,3113727

asked 2 hours ago

strythestrythe

737

add a comment | 

Just want to ask if this is a normal run time when creating new attributes and writing the values of more than 30,000 features. This is for a script I'm writing.

Time to change attribute value: 0:03:44.954493

The process takes approximately 4 minutes just to execute this code

mem_layer.startEditing()

startendField = QgsField(fieldname1, QVariant.String)

durationField = QgsField(fieldname2, QVariant.String)

prov = mem_layer.dataProvider()

prov.addAttributes([startendField])

prov.addAttributes([durationField])

mem_layer.updateFields()

t0 = datetime.now()

i=0

for feat in mem_layer.getFeatures():

     #mem_layer.changeAttributeValue(feat.id(),newdatetimeIdx, 12345.67890)

     feat.setAttribute(fieldname1, startend_tbl[i])

     feat.setAttribute(fieldname2, duration_tbl[i])

     #feat[fieldname1] = startend_tbl[i]

     #feat[fieldname2] = duration_tbl[i]

     mem_layer.updateFeature(feat)

     i+=1

mem_layer.commitChanges()

t1 = datetime.now()

feedback.pushInfo('Time to change attribute value: {}'.format(str(t1-t0)))

I read somewhere that using the data provider is not the most efficient method but I don't have any idea what the other options are.

pyqgis qgis-3

share|improve this question

edited 4 mins ago

Taras

2,3113727

asked 2 hours ago

strythestrythe

737

Time to change attribute value: 0:03:44.954493

mem_layer.startEditing()

startendField = QgsField(fieldname1, QVariant.String)

durationField = QgsField(fieldname2, QVariant.String)

prov = mem_layer.dataProvider()

prov.addAttributes([startendField])

prov.addAttributes([durationField])

mem_layer.updateFields()

t0 = datetime.now()

i=0

for feat in mem_layer.getFeatures():

     #mem_layer.changeAttributeValue(feat.id(),newdatetimeIdx, 12345.67890)

     feat.setAttribute(fieldname1, startend_tbl[i])

     feat.setAttribute(fieldname2, duration_tbl[i])

     #feat[fieldname1] = startend_tbl[i]

     #feat[fieldname2] = duration_tbl[i]

     mem_layer.updateFeature(feat)

     i+=1

mem_layer.commitChanges()

t1 = datetime.now()

feedback.pushInfo('Time to change attribute value: {}'.format(str(t1-t0)))

share|improve this question

edited 4 mins ago

Taras

2,3113727

asked 2 hours ago

strythestrythe

737

share|improve this question

edited 4 mins ago

Taras

2,3113727

asked 2 hours ago

strythestrythe

737

edited 4 mins ago

Taras

2,3113727

edited 4 mins ago

Taras

2,3113727

asked 2 hours ago

strythestrythe

737

asked 2 hours ago

strythestrythe

737