循环遍历python中的两个csv文件

Question

我正在尝试遍历两个csv文件，并希望比较下一列值和前一列之间的字符串。程序正在使用一个csv文件，但有两个csv文件，它给出错误：File＆＃34; Gaze_calculaton.py＆＃34;，88行in                    如果行[3] ==＆＃34;凝视机器人＆＃34;：                    IndexError：列表索引超出范围

在第一个文件的末尾给出错误。我尝试了一些东西，但它没有用。请帮助，因为我是csvloop处理的新手。

import csv
import os,sys
import glob

dirListing = glob.glob('/home/shruti/Desktop/Final eaf files/Teacher Gaze/*.csv')
print dirListing
for fname in dirListing:
    `enter code here`last =None
last1 =None

with open(fname,'rb') as f:
    for row in list(csv.reader(f, delimiter=',')):
       #print row[3]

       i      += 1
       print i 
       print fname
       if last == "Gaze at robot" and row[3]== "Gaze at learner" :
           b += 1
           print "b",b 
           print last
           print row[3]
       if last1 == "Gaze at learner" and row[3]== "Gaze at robot" :
           c += 1
           print "c",c 
           print last1
           print row[3]     
       if row[3] == "Gaze at robot":
           last = row[3]
       if row[3] == "Gaze at learner":
           last1 = row[3]

    print b,c
    f.close()