4

I am attempting to run a union operation in a standalone pyqgis script and I'm receiving this error: Algorithm qgis:union not found

The union operation fails with this code:

params = {
    'INPUT' : vlayer,
    'OVERLAY' : vlayer2,
    'OUTPUT' : r'd:\tmp\union-test.shp'
}

operation='native:union'

feedback = QgsProcessingFeedback()

res = processing.run(operation, params, feedback=feedback)

When I attempt to run Processing.updateAlgsList(), I receive this error:

'Processing' has no attribute 'updateAlgsList'

Is this function named something else in pyqgis3?

I am using OSGeo4W64 on windows and appending the python plugins path:
sys.path.append(r'C:\OSGeo4W64\apps\qgis\python\plugins')

gdal:aspect
gdal:assignprojection
gdal:buffervectors
gdal:buildvirtualraster
gdal:cliprasterbyextent
gdal:cliprasterbymasklayer
gdal:clipvectorbyextent
gdal:clipvectorbypolygon
gdal:colorrelief
gdal:contour
gdal:convertformat
gdal:dissolve
gdal:executesql
gdal:extractprojection
gdal:fillnodata
gdal:gdal2tiles
gdal:gdal2xyz
gdal:gdalinfo
gdal:gridaverage
gdal:griddatametrics
gdal:gridinversedistance
gdal:gridinversedistancenearestneighbor
gdal:gridlinear
gdal:gridnearestneighbor
gdal:hillshade
gdal:importvectorintopostgisdatabaseavailableconnections
gdal:importvectorintopostgisdatabasenewconnection
gdal:merge
gdal:nearblack
gdal:offsetcurve
gdal:ogrinfo
gdal:onesidebuffer
gdal:overviews
gdal:pcttorgb
gdal:pointsalonglines
gdal:polygonize
gdal:proximity
gdal:rastercalculator
gdal:rasterize
gdal:rearrange_bands
gdal:retile
gdal:rgbtopct
gdal:roughness
gdal:sieve
gdal:slope
gdal:tileindex
gdal:tpitopographicpositionindex
gdal:translate
gdal:triterrainruggednessindex
gdal:warpreproject
grass7:i.albedo
grass7:i.aster.toar
grass7:i.atcorr
grass7:i.biomass
grass7:i.cca
grass7:i.cluster
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grass7:r.describe
grass7:r.distance
grass7:r.drain
grass7:r.fill.dir
grass7:r.fill.stats
grass7:r.fillnulls
grass7:r.flow
grass7:r.grow
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grass7:r.report
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grass7:r.rescale
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grass7:r.series
grass7:r.series.accumulate
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grass7:v.buffer
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grass7:v.build.polylines
grass7:v.class
grass7:v.clean
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grass7:v.decimate
grass7:v.delaunay
grass7:v.dissolve
grass7:v.distance
grass7:v.drape
grass7:v.edit
grass7:v.extract
grass7:v.extrude
grass7:v.generalize
grass7:v.hull
grass7:v.in.ascii
grass7:v.in.dxf
grass7:v.in.e00
grass7:v.in.geonames
grass7:v.in.lidar
grass7:v.in.lines
grass7:v.in.mapgen
grass7:v.in.wfs
grass7:v.info
grass7:v.kcv
grass7:v.kernel.rast
grass7:v.kernel.vector
grass7:v.lidar.correction
grass7:v.lidar.edgedetection
grass7:v.lidar.growing
grass7:v.mkgrid
grass7:v.neighbors
grass7:v.net
grass7:v.net.alloc
grass7:v.net.allpairs
grass7:v.net.bridge
grass7:v.net.centrality
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grass7:v.net.connectivity
grass7:v.net.distance
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grass7:v.net.path
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grass7:v.net.salesman
grass7:v.net.spanningtree
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grass7:v.net.visibility
grass7:v.normal
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grass7:v.out.dxf
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grass7:v.outlier
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grass7:v.type
grass7:v.univar
grass7:v.vect.stats
grass7:v.voronoi
grass7:v.what.rast
grass7:v.what.vect
qgis:addfieldtoattributestable
qgis:advancedpythonfieldcalculator
qgis:aggregate
qgis:aspect
qgis:barplot
qgis:basicstatisticsforfields
qgis:boxplot
qgis:buildvirtualvector
qgis:checkvalidity
qgis:concavehull
qgis:convertgeometrytype
qgis:countpointsinpolygon
qgis:createattributeindex
qgis:createconstantrasterlayer
qgis:creategrid
qgis:createpointslayerfromtable
qgis:createspatialindex
qgis:definecurrentprojection
qgis:delaunaytriangulation
qgis:deletecolumn
qgis:deleteduplicategeometries
qgis:densifygeometries
qgis:densifygeometriesgivenaninterval
qgis:distancematrix
qgis:distancetonearesthublinetohub
qgis:distancetonearesthubpoints
qgis:eliminateselectedpolygons
qgis:executesql
qgis:exportaddgeometrycolumns
qgis:extractspecificvertices
qgis:fieldcalculator
qgis:findprojection
qgis:generatepointspixelcentroidsalongline
qgis:generatepointspixelcentroidsinsidepolygons
qgis:geometrybyexpression
qgis:heatmapkerneldensityestimation
qgis:hillshade
qgis:hypsometriccurves
qgis:idwinterpolation
qgis:importintopostgis
qgis:importintospatialite
qgis:joinattributesbylocation
qgis:joinbylocationsummary
qgis:keepnbiggestparts
qgis:knearestconcavehull
qgis:linestopolygons
qgis:listuniquevalues
qgis:meanandstandarddeviationplot
qgis:minimumboundinggeometry
qgis:nearestneighbouranalysis
qgis:orthogonalize
qgis:pointsalonglines
qgis:pointsdisplacement
qgis:pointstopath
qgis:polarplot
qgis:poleofinaccessibility
qgis:polygonfromlayerextent
qgis:polygonize
qgis:polygonstolines
qgis:postgisexecuteandloadsql
qgis:postgisexecutesql
qgis:randomextract
qgis:randomextractwithinsubsets
qgis:randompointsalongline
qgis:randompointsinextent
qgis:randompointsinlayerbounds
qgis:randompointsinsidepolygons
qgis:randomselection
qgis:randomselectionwithinsubsets
qgis:rastercalculator
qgis:rasterize
qgis:rasterlayerhistogram
qgis:rasterlayerstatistics
qgis:rastersampling
qgis:rectanglesovalsdiamondsfixed
qgis:rectanglesovalsdiamondsvariable
qgis:refactorfields
qgis:regularpoints
qgis:relief
qgis:ruggednessindex
qgis:scatter3dplot
qgis:selectbyattribute
qgis:selectbyexpression
qgis:serviceareafromlayer
qgis:serviceareafrompoint
qgis:setmvalue
qgis:setstyleforrasterlayer
qgis:setstyleforvectorlayer
qgis:setzvalue
qgis:singlesidedbuffer
qgis:slope
qgis:snapgeometries
qgis:spatialiteexecutesql
qgis:splitvectorlayer
qgis:statisticsbycategories
qgis:sumlinelengths
qgis:texttofloat
qgis:tininterpolation
qgis:topologicalcoloring
qgis:truncatetable
qgis:variabledistancebuffer
qgis:vectorlayerhistogram
qgis:vectorlayerscatterplot
qgis:voronoipolygons
qgis:zonalstatistics
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saga:topographicopenness
saga:topographicpositionindextpi
saga:topographicwetnessindextwi
saga:tpibasedlandformclassification
saga:transectthroughpolygonshapefile
saga:transformvectorlayer
saga:transposerasterlayers
saga:triangulation
saga:universalkriging
saga:upslopeanddownslopecurvature
saga:upslopearea
saga:userdefinedfilter
saga:valleyandridgedetectiontophatapproach
saga:valleydepth
saga:variabledistancebuffer
saga:variogramcloud
saga:variogramsurface
saga:vectorisinggridclasses
saga:vectorruggednessmeasurevrm
saga:vegetationindexdistancebased
saga:vegetationindexslopebased
saga:verticaldistancetochannelnetwork
saga:warpingshapes
saga:waterretentioncapacity
saga:watershedbasins
saga:watershedsegmentation
saga:watershedsegmentationvigra
saga:windeffect
saga:windexpositionindex
saga:zonalmultipleregressionanalysispointsandpredictorgrids
saga:zonalrasterstatistics
  • You could try calling the union algorithm using native:union instead of qgis:union. – Joseph Jan 7 at 11:58
  • Using native:union results in Error: Algorithm native:union not found – Jay Cummins Jan 7 at 13:31
  • How are you running the algorithm and what commands did you use? Are you running it inside QGIS via the python console or script; or externally via a standalone script? – Joseph Jan 7 at 13:48
  • @Joseph: It's a standalone script. I've updated the question with a code snippet. – Jay Cummins Jan 7 at 14:03
0

I had the same issue. Following this post, I resolved it by adding the following lines of code before calling the native algorithm:

from qgis.analysis import QgsNativeAlgorithms

QgsApplication.processingRegistry().addProvider(QgsNativeAlgorithms())

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