关于pymysql的问题？

con = pymysql.connect(user="root",  
                    password=pw,
                    host="LocalHost",
                    database=None,
                    port=3306,
                    charset="utf8")
    # 创建游标
cur = con.cursor()
cur.execute("drop database %s;", "douban") # 这样写会出错
# cur.execute("drop database douban;") #这样写不会出错

为什么倒数第二行会报错？把倒数第二行换成倒数第一行就不会报错？

报错如下

File "D:/PyQt5/滤波/爬虫/豆瓣电影.py", line 34, in mysql_data
    cur.execute("drop database %s;", 'douban')
  File "C:\Users\ASUS\AppData\Local\Programs\Python\Python38\lib\site-packages\pymysql\cursors.py", line 148, in execute
    result = self._query(query)
  File "C:\Users\ASUS\AppData\Local\Programs\Python\Python38\lib\site-packages\pymysql\cursors.py", line 310, in _query
    conn.query(q)
  File "C:\Users\ASUS\AppData\Local\Programs\Python\Python38\lib\site-packages\pymysql\connections.py", line 548, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "C:\Users\ASUS\AppData\Local\Programs\Python\Python38\lib\site-packages\pymysql\connections.py", line 775, in _read_query_result
    result.read()
  File "C:\Users\ASUS\AppData\Local\Programs\Python\Python38\lib\site-packages\pymysql\connections.py", line 1156, in read
    first_packet = self.connection._read_packet()
  File "C:\Users\ASUS\AppData\Local\Programs\Python\Python38\lib\site-packages\pymysql\connections.py", line 725, in _read_packet
    packet.raise_for_error()
  File "C:\Users\ASUS\AppData\Local\Programs\Python\Python38\lib\site-packages\pymysql\protocol.py", line 221, in raise_for_error
    err.raise_mysql_exception(self._data)
  File "C:\Users\ASUS\AppData\Local\Programs\Python\Python38\lib\site-packages\pymysql\err.py", line 143, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.ProgrammingError: (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''douban'' at line 1")

Process finished with exit code 1

cur.execute("drop database %s;" % "douban")