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PL/Python: Update example

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

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Original file line number	Diff line number	Diff line change
`@@ -955,11 +955,7 @@ rv = plpy.execute(plan, [ "name" ], 5)`
`955`	`955`	`<xref linkend="plpython-sharing">). For example:`
`956`	`956`	`<programlisting>`
`957`	`957`	`CREATE FUNCTION usesavedplan() RETURNS trigger AS $$`
`958`		`- if SD.has_key("plan"):`
`959`		`- plan = SD["plan"]`
`960`		`- else:`
`961`		`- plan = plpy.prepare("SELECT 1")`
`962`		`- SD["plan"] = plan`
	`958`	`+ plan = SD.setdefault("plan", plpy.prepare("SELECT 1"))`
`963`	`959`	`# rest of function`
`964`	`960`	`$$ LANGUAGE plpythonu;`
`965`	`961`	`</programlisting>`

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