python小白,求救贴。请大神指导一下

这是错误

 self.assertFalse(ipValues[iNum],valueList2[iNum],"The result of sorti
TypeError: 'NoneType' object is unsubscriptable

源码: 文件名:logtest.py

#!/usr/bin/python 
def countIP(file):
 ipCounter = {}
 testF = open(file,"r+")
 for line in testF.readlines():
 if '[client ' in line:
 ip = line.split('[client ')[1].split(']')[0]
 ipCounter[ip] = ipCounter.get(ip,0)+1
 ipCounter = sorted(ipCounter.iteritems(), key = lambda d:d[1], reverse=True)
 print (ipCounter)
 testF.close()
 return ipCounter

单测代码 test_logtest.py

import unittest
import logtest
class TestCase(unittest.TestCase):
def testother_file_test(self):
 """check mail_log in different text"""
 self.assertTrue(logtest.countIP("error_log.2015年11月18日-18"))
def testvalue_test(self):
 """check ip`s value is sorted or not"""
 ipVList = {}
 ipValues = []
 ipVList = logtest.countIP("error_log.2015年11月18日-18")
 for l in ipVList:
 ipValue = l[1]
 ipValues.append(ipValue)
 valueList2 = []
 valueList2 = ipValues.sort(reverse = True) 
 if not ipValues:
 for iNum in range(len(ipValues)):
 self.assertFalse(ipValues[iNum],valueList2[iNum],"The result of sorting is wrong")
 if __name__ == '__main__':
 unittest.main()