Initial commit of Python queries and QL libraries.

python/ql/src/Functions/OverlyComplexDelMethod.ql

@@ -0,0 +1,21 @@
+/**
+ * @name Overly complex __del__ method
+ * @description __del__ methods may be called at arbitrary times, perhaps never called at all, and should be simple.
+ * @kind problem
+ * @tags efficiency
+ *       maintainability
+ *       complexity
+ *       statistical
+ *       non-attributable
+ * @problem.severity recommendation
+ * @sub-severity low
+ * @precision high
+ * @id py/overly-complex-delete
+ */
+
+import python
+
+from FunctionObject method
+where exists(ClassObject c | c.declaredAttribute("__del__") = method and
+method.getFunction().getMetrics().getCyclomaticComplexity() > 3)
+select method, "Overly complex '__del__' method."