user: Question: How many vacators were in the Pennsylvania 33rd district?
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Missouri 11th', 'John B. Sullivan (D)', 'Died January 29, 1951', 'Claude I. Bakewell (R)', 'March 9, 1951']
SQL:

assistant: SELECT COUNT("Vacator") FROM "Table" WHERE "District" = 'Pennsylvania 33rd';