user: Question: How many discs for The Complete 4th Series?
Columns: ['Season', 'Date Released', '# Of Episodes', '# Of Discs', 'Special Features']
Types: ['text', 'text', 'real', 'real', 'text']
Sample row: ['The Complete 1st Series', '30 July 2009', 13.0, 4.0, 'Behind the scenes.']
SQL:

assistant: SELECT "# Of Discs" FROM "Table" WHERE "Season" = 'The Complete 4th Series';