[问题求助] 新人求教SVN钩子Python脚本问题

潘多拉

# -*- coding: utf-8 -*-
 
SVN_LOOK_PATH = 'F:\\Program Files (x86)\\VisualSVN Server\\bin\\svnlook.exe'
 
import subprocess
import sys
import re
 
 
repos = sys.argv[1]
txn = sys.argv[2]
 
filteroutlist = ('.java','.class','.rar','.zip')
 
#获取当前提交文件路径
changed = subprocess.check_output([SVN_LOOK_PATH, 'changed', repos, '-t', txn])
#sys.stderr.write('changed:%s'% changed)
#exit(1)
for line in changed.split('\n'):
	#sys.stderr.write('line:%s'% line)
	#exit(1)
	#获取文件的后缀名
	suffix=line[line.rfind('.'):]
	#如果获取到空值跳过
	if suffix is None:
		continue
	else:
		sys.stderr.write('suffix:%s'% suffix)
		exit(1)COPY

按照我的想法应该在提交报错的是时候会列出空值以外的后缀名，可我报错还是获取了空值，求教：我哪边写错了。。。
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