CREATE TABLE table_7396 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" TEXT)

How many weeks have pittsburgh steelers as the opponent?
SELECT COUNT("Week") FROM table_7396 WHERE "Opponent" = 'pittsburgh steelers'
SELECT COUNT("Week") FROM "table_7396" WHERE "Opponent" = 'pittsburgh steelers'