11- Execute QGIS processing algorithms using Python

Are you looking for a way to execute QGIS processing algorithms using Python? Look no further than the processing.run method in PyQGIS! With just two arguments - the name of the algorithm and a dictionary of algorithm parameters - you can easily create buffers and load them as new layers.

processing.run is a method in PyQGIS that allows you to execute QGIS processing algorithms using Python. The method takes two arguments: the name of the algorithm as a string and a dictionary of algorithm parameters.

Identify the path of the shapefile:

uri = "D:/Python_QGIS/data/KRG_Cities.shp"

Using the processing.run() method to create a buffer to the shapefile:

processing.run("native:buffer", {'INPUT': uri,
               'DISTANCE': 100.0,
               'SEGMENTS': 10,
               'DISSOLVE': True,
               'END_CAP_STYLE': 0,
               'JOIN_STYLE': 0,
               'MITER_LIMIT': 10,
               'OUTPUT': 'D:/Python_QGIS/data/buffers.shp'})

Load the result as a new layer using the "processing.runAndLoadResults" method:

processing.runAndLoadResults("native:buffer", 
                {'INPUT':uri,
                'DISTANCE':1,
                'SEGMENTS':5,
                'END_CAP_STYLE':0,
                'JOIN_STYLE':0,
                'MITER_LIMIT':2,
                'DISSOLVE':False,
                'OUTPUT':'memory:'})

In conclusion, the article explains how to execute QGIS processing algorithms using Python with the help of the processing.run method in PyQGIS. By providing the name of the algorithm and a dictionary of algorithm parameters, users can create buffers and load them as new layers. The article also provides an example of how to identify the path of a shapefile, create a buffer to it, and load the result as a new layer using the processing.runAndLoadResults method.

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