Python: Fix too many results from DataFlow::importNode

python/ql/src/semmle/python/dataflow/new/internal/DataFlowUtil.qll

@@ -68,5 +68,11 @@ Node importNode(string name) {
   // Because named imports are modelled as `AttrRead`s, the statement `from foo import bar as baz`
   // is interpreted as if it was an assignment `baz = foo.bar`, which means `baz` gets tracked as a
   // reference to `foo.bar`, as desired.
-  result.asCfgNode().getNode() = any(ImportExpr i | i.getName() = name)
+  exists(ImportExpr imp_expr |
+    imp_expr.getName() = name and
+    result.asCfgNode().getNode() = imp_expr and
+    // in `import foo.bar` we DON'T want to give a result for `importNode("foo.bar")`,
+    // only for `importNode("foo")`. We exclude those cases with the following clause.
+    not exists(Import imp | imp.getAName().getValue() = imp_expr)
+  )
 }