Initial commit of Python queries and QL libraries.

python/ql/src/Expressions/IncorrectComparisonUsingIs.py

@@ -0,0 +1,27 @@
+
+DEFAULT = "default"
+
+def get_color(name, fallback):
+    if name in COLORS:
+        return COLORS[name]
+    elif fallback is DEFAULT:
+        return DEFAULT_COLOR
+    else:
+        return fallback
+
+#This works
+print (get_color("spam", "def" + "ault"))
+
+#But this does not
+print (get_color("spam", "default-spam"[:7]))
+
+#To fix the above code change to object
+DEFAULT = object()
+
+#Or if you want better repr() output:
+class Default(object):
+
+    def __repr__(self):
+        return "DEFAULT"
+
+DEFAULT = Default()