[Backport release-3_40] Script template - Add Python annotations

python/plugins/processing/script/ScriptTemplate.py

@@ -9,14 +9,17 @@
 ***************************************************************************
 """
 
-from qgis.PyQt.QtCore import QCoreApplication
+from typing import Any, Optional
+
 from qgis.core import (
-    QgsProcessing,
     QgsFeatureSink,
-    QgsProcessingException,
+    QgsProcessing,
     QgsProcessingAlgorithm,
-    QgsProcessingParameterFeatureSource,
+    QgsProcessingContext,
+    QgsProcessingException,
+    QgsProcessingFeedback,
     QgsProcessingParameterFeatureSink,
+    QgsProcessingParameterFeatureSource,
 )
 from qgis import processing
 
@@ -42,16 +45,7 @@ class ExampleProcessingAlgorithm(QgsProcessingAlgorithm):
     INPUT = "INPUT"
     OUTPUT = "OUTPUT"
 
-    def tr(self, string):
-        """
-        Returns a translatable string with the self.tr() function.
-        """
-        return QCoreApplication.translate("Processing", string)
-
-    def createInstance(self):
-        return ExampleProcessingAlgorithm()
-
-    def name(self):
+    def name(self) -> str:
         """
         Returns the algorithm name, used for identifying the algorithm. This
         string should be fixed for the algorithm, and must not be localised.
@@ -61,21 +55,21 @@ def name(self):
         """
         return "myscript"
 
-    def displayName(self):
+    def displayName(self) -> str:
         """
         Returns the translated algorithm name, which should be used for any
         user-visible display of the algorithm name.
         """
-        return self.tr("My Script")
+        return "My Script"
 
-    def group(self):
+    def group(self) -> str:
         """
         Returns the name of the group this algorithm belongs to. This string
         should be localised.
         """
-        return self.tr("Example scripts")
+        return "Example scripts"
 
-    def groupId(self):
+    def groupId(self) -> str:
         """
         Returns the unique ID of the group this algorithm belongs to. This
         string should be fixed for the algorithm, and must not be localised.
@@ -85,15 +79,15 @@ def groupId(self):
         """
         return "examplescripts"
 
-    def shortHelpString(self):
+    def shortHelpString(self) -> str:
         """
         Returns a localised short helper string for the algorithm. This string
         should provide a basic description about what the algorithm does and the
-        parameters and outputs associated with it..
+        parameters and outputs associated with it.
         """
-        return self.tr("Example algorithm short description")
+        return "Example algorithm short description"
 
-    def initAlgorithm(self, config=None):
+    def initAlgorithm(self, config: Optional[dict[str, Any]] = None):
         """
         Here we define the inputs and output of the algorithm, along
         with some other properties.
@@ -104,7 +98,7 @@ def initAlgorithm(self, config=None):
         self.addParameter(
             QgsProcessingParameterFeatureSource(
                 self.INPUT,
-                self.tr("Input layer"),
+                "Input layer",
                 [QgsProcessing.SourceType.TypeVectorAnyGeometry],
             )
         )
@@ -113,10 +107,15 @@ def initAlgorithm(self, config=None):
         # usually takes the form of a newly created vector layer when the
         # algorithm is run in QGIS).
         self.addParameter(
-            QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr("Output layer"))
+            QgsProcessingParameterFeatureSink(self.OUTPUT, "Output layer")
         )
 
-    def processAlgorithm(self, parameters, context, feedback):
+    def processAlgorithm(
+        self,
+        parameters: dict[str, Any],
+        context: QgsProcessingContext,
+        feedback: QgsProcessingFeedback,
+    ) -> dict[str, Any]:
         """
         Here is where the processing itself takes place.
         """
@@ -199,3 +198,6 @@ def processAlgorithm(self, parameters, context, feedback):
         # dictionary, with keys matching the feature corresponding parameter
         # or output names.
         return {self.OUTPUT: dest_id}
+
+    def createInstance(self):
+        return self.__class__()