Initial commit of Python queries and QL libraries.

python/ql/src/Functions/DeprecatedSliceMethod.ql

@@ -0,0 +1,24 @@
+/**
+ * @name Deprecated slice method
+ * @description Defining special methods for slicing has been deprecated since Python 2.0.
+ * @kind problem
+ * @tags maintainability
+ * @problem.severity warning
+ * @sub-severity high
+ * @precision very-high
+ * @id py/deprecated-slice-method
+ */
+
+import python
+
+predicate slice_method_name(string name) {
+  name = "__getslice__" or name = "__setslice__" or name = "__delslice__"
+}
+
+from PyFunctionObject f, string meth
+
+where f.getFunction().isMethod() and not f.isOverridingMethod() and
+      slice_method_name(meth) and f.getName() = meth
+  
+      
+select f, meth + " method has been deprecated since Python 2.0"