Python: more tests and comments

python/ql/test/experimental/dataflow/module-initialization/localFlow.ql

@@ -0,0 +1,20 @@
+// This query should be more focused yet.
+import python
+import semmle.python.dataflow.new.DataFlow
+
+pragma[inline]
+predicate inCodebase(DataFlow::Node node) { exists(node.getLocation().getFile().getRelativePath()) }
+
+predicate isTopLevel(DataFlow::Node node) { node.getScope() instanceof Module }
+
+predicate inFocus(DataFlow::Node node) {
+  isTopLevel(node) and
+  inCodebase(node)
+}
+
+from DataFlow::Node nodeFrom, DataFlow::Node nodeTo
+where
+  inFocus(nodeFrom) and
+  inFocus(nodeTo) and
+  DataFlow::localFlowStep(nodeFrom, nodeTo)
+select nodeFrom, nodeTo