python 读/写文件的文件列表

Question

在 python 2.7 中，我需要对文件列表的列表执行相同的操作。

例子， # 每个文件都是一个文件描述符 例如，fileX = open("someString", "a")

 fileList1 = [file1, file2, file3,file4,file5] 
 fileList2 = [file11, file21, file31,file41,file51] 
 allFilelist = [fileList1, fileList2]

当我尝试在上面读/写一些字符串时，我得到:

 line = item.readline()
 IOError: [Errno 9] Bad file descriptor

---

 # each file in allFilList is a file list 
 allFilList = [ifcxRpsFileNameL, ircxRpsFileNameL, transXRpsFileNameL, ifcxFileNameL, 
 ircxFileNameL, transXFileNameL]
 for eachFileList in allFilList :
    for item in eachFileList :
            #print item.read 
            line = item.readline()
            #for line in :
            print "the line read from ", item, " is " , line
            ll= line.strip("\n").split()
            if len(ll) == 0 :
                print "the file " , item , " is empty \n"
                exit  
            elif len(ll) != TOTAL_ITR :
                print "the len of the file " , item , " is not " , TOTAL_ITR , "\n"
                exit
            else:
                item.write("\n")
                lt = [float(num) for num in ll]
                item.write(min(lt))
                item.write(" ") 
                item.write(sum(lt)/len(lt))
                item.write(" ")
                item.write(max(lt))
                item.write(" ")
                item.write("\n")
                item.close()
                break

回应这条评论:

print out item before you try to read from it and post the output

输出是:<open file 'ND_ifxc_2010_RPS.dat', mode 'a' at 0x2ba38d1e9558>

Answer 1

您遇到的问题是因为您打开的文件是以 'a' 模式打开的，因此不是为了阅读。因此，尝试读取未打开以供读取的文件会出错。

您最好存储一个文件路径列表，然后这样做:

1. 以'r'模式打开
2. 读行
3. 根据您的情况，关闭它们，以 'a' 模式重新打开并编写所需的行。

希望对你有帮助