Learn QGIS - Fourth Edition

Building a basic buffer script

From the Processing Toolbox, click on the Python button and select Create New Script..., as shown in the following screenshot:

Create a new script

In a blank script, copy the following code:

import processingfrom qgis.PyQt.QtCore import QCoreApplicationfrom qgis.core import QgsProcessingAlgorithm, QgsProcessing, QgsProcessingParameterFeatureSink,QgsProcessingParameterFeatureSourceclass testAlg(QgsProcessingAlgorithm): OUTPUT = 'OUTPUT' INPUT = 'INPUT' def tr(self, text):     return QCoreApplication.translate('testalg', text) def createInstance(self):     return type(self)() def group(self):     return self.tr('Test') def ...