python 新手问题啊，为什么我运行一个python程序，另一个就会自动退出呢？始终只能运行一个

/data/python/caiji_asc.py
/data/python/caiji_desc.py
两个文件的代码几乎一样的，就是查询mysql的时候order 排序不一样
下面是具体代码，刚学几天，网上东拼西凑出来的，高手帮忙看看吧

我用ssh连接服务器 运行这两个python 程序始终都是一个运行了另一个自动exit。。实在不明白怎么回事？？

#!/usr/bin/python
#-*-coding:utf-8-*-

import MySQLdb, os, socket, time;
import MySQLdb.cursors;
import urllib

User = 'root';
Passwd = '123456';
Host = 'localhost';
Db = 'test_xs';
conn = MySQLdb.connect(user=User,passwd=Passwd,host=Host,db=Db);
mysql = conn.cursor(cursorclass = MySQLdb.cursors.DictCursor);

mysql.execute("select * from image order by id asc");
result = mysql.fetchall();

startTime = time.time();

timeout = 10; # in seconds
socket.setdefaulttimeout(timeout);

for row in result:
dir = os.path.dirname(row['path']);

if not os.path.exists(dir):
os.makedirs(dir);
os.chmod(dir, 0777);
os.chmod(os.path.dirname(dir), 0777);

data = urllib.urlretrieve(row['url'], row['path']);
os.chmod(row['path'], 0777);

mysql.execute("delete from image where id = %s", row['id']);

passTime = int(time.time()) - int(startTime);
if passTime >= 3600:
break;

print str(row['id']);

mysql.close();
conn.close();

[root@localhost ~]# nohup /data/python/caiji_asc.py > /dev/null 2>&1 &
[1] 4272
[root@localhost ~]# nohup /data/python/caiji_desc.py > /dev/null 2>&1 &
[2] 4273
[1] Exit 126 nohup /data/python/caiji_asc.py > /dev/null 2>&1
[root@localhost ~]# nohup /data/python/caiji_asc.py > /dev/null 2>&1 &
[3] 4274
[2] Exit 126 nohup /data/python/caiji_desc.py > /dev/null 2>&1
[root@localhost ~]# nohup python /data/python/caiji_asc.py > /dev/null 2>&1 &
[4] 4275
[3] Exit 126 nohup /data/python/caiji_asc.py > /dev/null 2>&1
[root@localhost ~]# nohup /data/python/caiji_asc.py > /dev/null 2>&1 &
[5] 4277
[root@localhost ~]# nohup /data/python/caiji_desc.py > /dev/null 2>&1 &
[6] 4278
[5] Exit 126 nohup /data/python/caiji_asc.py > /dev/null 2>&1
[root@localhost ~]# /data/python/caiji_desc.py > /dev/null 2>&1 &
[7] 4283
[4] Done nohup python /data/python/caiji_asc.py > /dev/null 2>&1
[6] Exit 126 nohup /data/python/caiji_desc.py > /dev/null 2>&1
[root@localhost ~]# /data/python/caiji_asc.py > /dev/null 2>&1 &
[8] 4284
[7] Exit 126 /data/python/caiji_desc.py > /dev/null 2>&1
貌似数据库里面数据已经都被删除了的问题吧 。。 现在测试又正常了。 晕死。。