python删除过期log文件操作实例解析

import os 
 
for i in os.walk('test'): 
   print i 

for i in os.walk('test'): 
   #print i 
   for j in i[2]: 
     os.path.join(i[0],j) 

def walk(dir): 
  ret = [] 
  dir = os.path.abspath(dir) 
  for file in [file for file in os.listdir(dir) if not file in [".",".."]]: 
    nfile = os.path.join(dir,file) 
    if os.path.isdir(nfile): 
      ret.extend( walk(nfile) ) 
    else: 
      ret.append( nfile ) 
  return ret 

def shouldkeep(file): 
  if '.py' in file: 
    return True 
  elif '.conf' in file: 
    return True 
  elif 'current' in file: 
    return True 
  elif 'rtb' in file and datetime.datetime.fromtimestamp( os.path.getmtime(file) ) > datetime.datetime.now() - datetime.timedelta(3): 
    return True 
  # the log webdebug/popterr/webaccess/controller_slow/game/checking_social which are modified 6 day ago should be removed 
  elif datetime.datetime.fromtimestamp( os.path.getmtime(file) ) < \ 
     datetime.datetime.now() - datetime.timedelta(6)\ 
     and ('webdebug' in file \ 
     or 'potperr' in file\ 
     or 'webaccess' in file\ 
     or 'controller_slow' in file\ 
     or 'game.' in file\ 
     or 'checkin_social' in file\ 
     ): 
    return False 
  elif datetime.datetime.fromtimestamp( os.path.getmtime(file) ) < \ 
     datetime.datetime.now() - datetime.timedelta(2)\ 
     and ('queue.master.info' in file): 
    return False 
  elif datetime.datetime.fromtimestamp( os.path.getmtime(file) ) > \ 
     datetime.datetime.now() - datetime.timedelta(6): 
    return True 
  else: 
    return False 

files = walk('/var/server/log') 
for i in files: 
  if not shouldkeep(i): 
    print i, datetime.datetime.fromtimestamp( os.path.getmtime(i) ) 
    os.remove( i )