从Python检索数据并通过Python批量插入Mysql表

Question

我有以下适用于Python 3.7的代码

query= insert into table (a,b,c) values (%s,%s,%s)( Mysql query)
cursor.execute("SELECT count(*) FROM Test")
Count = cursor.fetchone()[0]
batch_size = 500 

for rownum in range(0, Count, batch_size):
conn.execute(
 "SELECT * FROM mytable WHERE ROWNUM %s",        (Oracle code)
(batch_size, rownum))
for row in cursor:
cursor.execute(query,row)

但是我遇到了错误

  

DatabaseError：ORA-01036：无效的变量名称/编号。

如何从Oracle DB批量向MySql插入500万条记录？