Python/Sqlite3 - is there a way to programmatically set .nullvalue? -

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currently, python storing string "none" nulls returned sqlite3. read can change default value nulls in sqlite3 @ command line, can set within python code?

i'd of blank results same without having loop through , check each value. want nulls returned sqlite3 empty string ("") instead of "none".

uses sql-function coalesce each column of left join.

select    a.id, a.value,    coalesce(b.id, ''), coalesce(b.value, '')       left outer join b on b.a_id = a.id

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