code: def load(self):
          
          retries = 1
          while True:
              assert self.database is None
              assert self.cursor is None
              assert self.inserts == 0
              empty = not os.path.exists(self.state_file)
              self.database = sqlite3.connect(self.state_file)
              self.cursor = self.database.cursor()
  
              # Try loading once to check that the file is indeed a database
              # and reformat it if it is not.
              try:
                  self._prepare_db(empty=empty)
                  return
              except sqlite3.DatabaseError:
                  self.cursor.close()
                  self.database.close()
                  self.database = None
                  self.cursor = None
                  self.inserts = 0
                  if retries > 0:
                      os.unlink(self.state_file)
                      retries -= 1
                  else:
                      raise
docs: Loads state database.