Use testsetup/doctest

Author: erlend-aasland

Doc/library/sqlite3.rst

@@ -1379,11 +1379,14 @@ Adapter and Converter Recipes
 
 This section shows recipes for common adapters and converters.
 
-.. code-block::
+.. testsetup::
 
-   import datetime
    import sqlite3
 
+.. doctest::
+
+   import datetime
+
    def adapt_date_iso(val):
        """Adapt datetime.date to ISO 8601 date."""
        return val.isoformat()