python3 ftplib:通过 mlsd() 检查目录是否存在

python3 ftplib: check if dir exists via mlsd()

我正在使用 Python3 和 ftplib。

我需要检查 ftp 服务器上的目录是否存在。 (如果没有,我可以创建它,而不是cwd进去,如果它已经存在我会直接cwd进去)。

我在这里看到了 Marek Marecki 的方法:How to make Python check if ftp directory exists?

if 'foo' in [name for name, data in list(remote.mlsd())]:

问题是这也会在名为 'foo'.

的文件上触发

是否有 Pythonic 方式来执行此操作(明确地使用 mlsd())? nlst() 已弃用

非常感谢!

我没有任何支持 MLSD 命令的服务器,所以我不确定如何使用 mlsd 执行此操作。 但是即使没有 MLSD 支持,这段代码也应该可以工作。

    items = []
    ftp.retrlines('LIST', items.append ) 
    items = map( str.split, items )
    directorys = [ item.pop() for item in items if item[0][0] == 'd' ]
    print( "directrys", directorys )
    print( 'foo' in directorys )

也感谢@arnial

我想到了以下内容:(mlsd 或 nslt)

use_mlsd = 1
if(use_mlsd):
  # if ftp server supports mlsd, use it, nlst is maked as deprecated in ftplib
  # check if remotefoldername exists
  remotefoldername_exists = 0
  for name, facts in f.mlsd(".",["type"]):
    if facts["type"] == "dir" and name == "remote_ftp":
      print("isdir: "+ name)
      remotefoldername_exists = 1
      break
  if(remotefoldername_exists == 0)
    ftp.mkd(remotefoldername)
    logging.debug("folder does not exitst, ftp.mkd: " + remotefoldername)
  else:
    logging.debug("folder did exist: " + remotefoldername)

else:
    # nlst legacy support for ftp servers that do not support mlsd e.g. vsftp
    items = []
    ftp.retrlines('LIST', items.append ) 
    items = map( str.split, items )
    dirlist = [ item.pop() for item in items if item[0][0] == 'd' ]
    #print( "directrys", directorys )
    #print( 'remote_ftp' in directorys )
    if not (remotefoldername in dirlist):
      ftp.mkd(remotefoldername)
      logging.debug("folder does not exitst, ftp.mkd: " + remotefoldername)
    else:
      logging.debug("folder did exist: " + remotefoldername)