python: add test documenting effect of scopes

Author: yoff

python/ql/test/library-tests/ApiGraphs/py3/test_captured.py

@@ -0,0 +1,14 @@
+from html import escape
+
+def p(x):
+    return escape(x) #$ use=moduleImport("html").getMember("escape").getReturn()
+
+def p_list(l):
+    return ", ".join(p(x) for x in l) #$ use=moduleImport("html").getMember("escape").getReturn()
+
+def pp_list(l):
+    def pp(x):
+        return escape(x) #$ use=moduleImport("html").getMember("escape").getReturn()
+
+    def pp_list_inner(l):
+        return ", ".join(pp(x) for x in l) #$ MISSING: use=moduleImport("html").getMember("escape").getReturn()