Python: Expose getParameter on ParameterNode

python/ql/src/experimental/dataflow/internal/DataFlowPublic.qll

@@ -151,6 +151,9 @@ class ParameterNode extends EssaNode {
   }
 
   override DataFlowCallable getEnclosingCallable() { this.isParameterOf(result, _) }
+
+  /** Gets the `Parameter` this `ParameterNode` represents. */
+  Parameter getParameter() { result = var.(ParameterDefinition).getParameter() }
 }
 
 /**

python/ql/src/semmle/python/essa/Essa.qll

@@ -567,6 +567,7 @@ class ParameterDefinition extends EssaNodeDefinition {
     exists(Function func | func.getKwarg() = this.getDefiningNode().getNode())
   }
 
+  /** Gets the `Parameter` this `ParameterDefinition` represents. */
   Parameter getParameter() { result = this.getDefiningNode().getNode() }
 }