logical python

import os  
import string  
import fileinput  
#日志的位置  
dir_log  = r"/python/logs"  
#日志合并后的文件位置  
file_csv = os.path.join(r"~", "log.csv" )  
if os.path.exists(file_csv):  
    os.remove(file_csv)  
      
output = open(file_csv, 'w+')  
output.write("level,time,pid,tid,Application,tag, text/n")  
for file in os.listdir(dir_log):  
    if not file.endswith(".log"):  
        print "WARN:%s is not a log file" %(file)  
        continue  
    print "INFO:process file %s" %(file)  
    for line in fileinput.input(os.path.join(dir_log, file)):  
        for type in ('level', ): #'E ', 'D '):  
            if line.find(type) != -1 :  
                output.write("%s,%s,%s,%s" %(file[4:16], fileinput.filelineno(), type, string.replace(line, ",", "|")))    
    fileinput.close()  
output.close