对不起，如果我回答了自己的问题，但是我找到了解决方案。
我尝试ftputil失败，所以我尝试了很多方法，最后，这可行：
def ftp_connect(path):
link = FTP(host = 'example.com', timeout = 5) #Keep low timeout
link.login(passwd = 'ftppass', user = 'ftpuser')
debug("%s - Connected to FTP" % strftime("%d-%m-%Y %H.%M"))
link.cwd(path)
return link
downloaded = open('/local/path/to/file.tgz', 'wb')
def debug(txt):
print txt
link = ftp_connect(path)
file_size = link.size(filename)
max_attempts = 5 #I dont want death loops.
while file_size != downloaded.tell():
try:
debug("%s while > try, run retrbinary\n" % strftime("%d-%m-%Y %H.%M"))
if downloaded.tell() != 0:
link.retrbinary('RETR ' + filename, downloaded.write, downloaded.tell())
else:
link.retrbinary('RETR ' + filename, downloaded.write)
except Exception as myerror:
if max_attempts != 0:
debug("%s while > except, something going wrong: %s\n \tfile lenght is: %i > %i\n" %
(strftime("%d-%m-%Y %H.%M"), myerror, file_size, downloaded.tell())
)
link = ftp_connect(path)
max_attempts -= 1
else:
break
debug("Done with file, attempt to download m5dsum")
[...]
在我的日志文件中，我发现：
01-12-2011 23.30 - Connected to FTP
01-12-2011 23.30 while > try, run retrbinary
02-12-2011 00.31 while > except, something going wrong: timed out
file lenght is: 1754695793 > 1754695793
02-12-2011 00.31 - Connected to FTP
Done with file, attempt to download m5dsum
可悲的是，即使文件已完全下载，我也必须重新连接到FTP，这在我的cas中不是问题，因为我也必须下载md5sum。
如您所见，我无法检测到超时并重试连接，但是当我超时时，我只是再次重新连接；如果有人知道如何在不创建新的ftplib.FTP实例的情况下重新连接，请告诉我;）
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