user: ### NOW ANSWER:
Question: How many weeks have pittsburgh steelers as the opponent?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 17, 1950', 'at Pittsburgh Steelers', 'W 18–7', '24,699']
SQL:

assistant: SELECT COUNT("Week") FROM "Table" WHERE "Opponent" = 'pittsburgh steelers';