io - I/O value error: Operation on closed file -

i can't see i'm doing wrong. i'm trying make program read excel file , create new file similar name , write excel row file.

the error occurs @ "for row in excelreader:"

here's code:

import os import csv dirlist=os.listdir("//gollum/tbg2/tbg2/forritgb") print dirlist filename in dirlist:    if ".csv" in filename:        open(filename, 'rb') csvfile:            excelreader = csv.reader(csvfile)        file=open("xml_"+dir, 'w+')        row in excelreader:            file.write(row)    else:        pass 

close file after for row in excelreader: loop