Making Voronoi polygons using Python Console of QGIS

Question

I am using QGIS 2.6.1-Brighton.

Can you find errors in my attempt to make Voronoi polygons using Python Console and suggest improvements?

I have tried the following scripts but got the errors.

output=processing.runalg("qgis:voronoipolygons",vlayer1, 0.000 ,"output_file.shp")

Nothing happened

import processing
output=processing.runalg("qgis:voronoipolygons",vlayer1,"output_file.shp")
Error: Wrong number of parameters
ALGORITHM: Voronoi polygons
 INPUT <parameters>
 BUFFER <parameters>
 OUTPUT <OutputVector>
output=processing.runalg("qgis:voronoipolygons",vlayer1,0.000%,"output_file.shp")
 File "<input>", line 1
 output=processing.runalg("qgis:voronoipolygons",vlayer1,0.000%,"output_file.shp")
^
SyntaxError: invalid syntax

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Answer 1

Use full path for output. And I suggest you to use runandload method instead of runalg in this case. It adds the output to "Layers" panel.

import processing 
output = processing.runandload("qgis:voronoipolygons", vlayer1, 0, "C:/path/to/output.shp")
# or for temporary layer
output = processing.runandload("qgis:voronoipolygons", vlayer1, 0, None)

Please review QGIS 2 section in this answer.