Where are plpy.execute python commands issued?

I've seen numerous references to this syntax but haven't found where you issue the command.

Tried it in a testpython.py file, no luck.
Can't find a plpy file anywhere.

I know it's going to be simple but need help.
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rv = plpy.execute("SELECT * FROM my_table", 5)

Thanks

Michael McInnis 6033 44th Ave. N.E. Seattle, WA 98115 206 517-4701