实例如下：

# 环境: python3.x

def getExportDbSql(db, index):	

# 获取导出一个数据库实例的sql语句
	sql = 'mysqldump -u%s -p%s -h%s -P%d --default-character-set=utf8 --databases mu_ins_s%s > %s.s%d.mu_ins_%d.sql' %(db['user'], db['pwd'], db['host'], db['port'], index, db['server'], index, index)
	return sql

def createDbBackupFile(fname, dbList):	

# 生成数据库导出的语句保存到文件
	if not fname or not dbList:
	return False

	f = open(fname, 'w')
	if f:
	f.write('echo @off

')
	for db in dbList:
	for index in db['indexList']:
	f.write('REM %s.s%d
' %(db['server'], index))
	f.write('%s

' %getExportDbSql(db, index))
	f.write('
')

	f.close()
	return True

	return False

def initDb(user, pwd, host, port, server_name, indexList):	

# 生成db字典对象并返回
	db = {}
	db['user'] = user
	db['pwd'] = pwd
	db['host'] = host
	db['port'] = port
	db['server'] = server_name
	db['indexList'] = indexList

	return db

def displayDb(db):
	print('user =', db['user'])
	print('pwd =', db['pwd'])
	print('host =', db['host'])
	print('port =', db['port'])
	print('server =', db['server'])
	print('indexList =', db['indexList'])
	print('
')

def displayList(list):
	for item in list:
	displayDb(item)

if __name__ == '__main__':
	db1 = initDb('root', '123456', '127.0.0.1', 3306, 'th1', [10000, 1, 3])
	db2 = initDb('root', '123456', '127.0.0.1', 3306, 'th2', [10000, 1])
	
	dbList = []
	dbList.append(db1)
	dbList.append(db2)

	#displayList(dbList)
	
	createDbBackupFile('export00.bat', dbList)