from qgis.core import QgsGeometry # Create a list of X,Y coordinate pairs representing a polyline coords = [(0,0), (10,10), (20,0)] # Use fromPolylineXY method to create a new QgsGeometry object from the coordinate pairs polyline = QgsGeometry.fromPolylineXY(coords) # Print the WKT representation of the new geometry object print(polyline.asWkt())This example creates a polyline geometry object using the fromPolylineXY method with a list of three coordinate pairs (0,0), (10,10), and (20,0). The resulting geometry is printed in Well-Known Text (WKT) format. Package library: qgis.core of Python.