Python学习-字符串a是否以字符串b开始或结束

[root@localhost /]#
[root@localhost /]# cat strduiqi.py
#!/bin/python
import os, stat
li=os.listdir('/software/script/shell')
st=[n for n in li if n.endswith(('.sh','.py'))]
for nm in st:
    os.chmod(nm,os.stat(nm).st_mode | stat.S_IXGRP)
[root@localhost /]#
[root@localhost /]#