python3ftplib：通过mlsd（）检查dir是否存在

Question

我在用Python3和ftplib。在

我需要检查ftp服务器上是否存在目录。（如果没有，我可以创建它，而不是cwd到它，如果它已经存在，我将直接cwd到它中）。在

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())]:

这样的问题也会在名为“foo”的文件上触发。在

有没有一种python方法来实现这一点（显式地使用mlsd（））？nlst（）已弃用

非常感谢！在

Answer 1

也要感谢@arnial

我有以下建议：（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)

Answer 2

我没有任何服务器支持MLSD命令，所以我不确定如何使用MLSD来实现这一点。 但是即使没有MLSD的支持，这个代码也应该可以工作。在

    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 )