docs: def create(self, sql=None):
          """CREATE this DATABASE.
  
          @param sql: (Optional) A string of psql (such as might be generated
          by pg_dump); it will be executed by psql(1) after creating the
          database.
          @type sql: str
  
          @rtype: None
          """
          create_sql = 'CREATE DATABASE {self.db_name} WITH OWNER {self.user}'
          create_sql = create_sql.format(**vars())
          self.super_psql(['-c', create_sql])
          if sql:
              self.psql_string(sql)