PL/Python: Update example

Change the usesavedplan() example to use a more modern Python style
using the .setdefault() function.

diff --git a/doc/src/sgml/plpython.sgml b/doc/src/sgml/plpython.sgml
index 618f8d055e919ba6ec4dae651fcbe1608e80b107..5a3c8caa689efcfcdc0094ddab1b32424dbd07ab 100644 (file)
--- a/doc/src/sgml/plpython.sgml
+++ b/doc/src/sgml/plpython.sgml
@@ -955,11 +955,7 @@ rv = plpy.execute(plan, [ "name" ], 5)
    ). For example:
 
 CREATE FUNCTION usesavedplan() RETURNS trigger AS $$
-    if SD.has_key("plan"):
-        plan = SD["plan"]
-    else:
-        plan = plpy.prepare("SELECT 1")
-        SD["plan"] = plan
+    plan = SD.setdefault("plan", plpy.prepare("SELECT 1"))
     # rest of function
 $$ LANGUAGE plpythonu;