qgis:JoinAttributeTable is giving a Syntax Error in QGIS 3.0

Question

I am new to QGIS 3.0 and using "qgis:Joinattributetable" for joining .csv and .shp file. Below is my code, but I am getting Syntax Error.

AttributeError: module Processing has no attribute 'runandLoadResults'

I don't know how to fix this. Any suggestions?

vectorLyr=QgsVectorLayer("C:/Test/demand/Demand.shp","BuildingLayer","ogr")
vectorLyr.isValid()
uri='file:///C:/Test/data.csv?delimiter=,'
infoLyr=QgsVectorLayer(uri,'Population','delimitedtext')
infoLyr.isValid()
QgsProject.instance().addMapLayer(vectorLyr)
QgsProject.instance().addMapLayer(infoLyr)
shpField='FID_1'
csvField='FID'
result=processing.runandLoadResults('qgis:joinattributetable',vectorLyr,infoLyr,shpField,csvField,None)

Answer 1

First of all, I think you need to modify your result because you misspelt it.

Secondly, .runAndLoadResults() takes only two parameters. In your case, the first one looks right and the second is wrong because it should be a dictionary with the necessary parameters.

Try this:

result = processing.runAndLoadResults('qgis:joinattributestable', parameters)

Hint: Set up your parameters = {}.

parameters = {'INPUT': vectorLyr,
              'JOIN': infoLyr,
...
}

And check these references as well:

• Using processing algorithms from the console
• Using processing.runandload in QGIS 3
• Optional parameters in QGIS Processing scripts & models
• PyQGIS 101: Running Processing tools