user: Question: What was the average week for the gaime against the philadelphia eagles with less than 31066 in attendance?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 17, 1961', 'at San Francisco 49ers', 'L 35-3', 43142.0]
SQL:

assistant: SELECT AVG("Week") FROM "Table" WHERE "Opponent" = 'philadelphia eagles' AND "Attendance" < 31066.0;