df = psql.read_sql(
    'select "Timestamp","Value" from "MyTable" where "Timestamp" BETWEEN %(dstart)s AND %(dfinish)s'
    , db, params={'dstart': datetime(2014, 6, 24, 16, 0), 'dfinish':
    datetime(2014, 6, 24, 17, 0)}, index_col=['Timestamp'])
Pandas read_sql with parameters