我使用ftplib连接到ftp站点.我想获取最近上传的文件并下载它.我能够连接到ftp服务器并列出文件,我也将它们放在一个列表中,并将日期字段转换为.是否有任何功能/模块可以获取最近的日期并从列表中输出整行？
#!/usr/bin/env python
import ftplib
import os
import socket
import sys
HOST = 'test'
def main():
try:
f = ftplib.FTP(HOST)
except (socket.error,socket.gaierror),e:
print 'cannot reach to %s' % HOST
return
print "Connect to ftp server"
try:
f.login('anonymous','al@ge.com')
except ftplib.error_perm:
print 'cannot login anonymously'
f.quit()
return
print "logged on to the ftp server"
data = []
f.dir(data.append)
for line in data:
datestr = ' '.join(line.split()[0:2])
orig-date = time.strptime(datestr,'%d-%m-%y %H:%M%p')
f.quit()
return
if __name__ == '__main__':
main()
解决：
data = []
f.dir(data.append)
datelist = []
filelist = []
for line in data:
col = line.split()
datestr = ' '.join(line.split()[0:2])
date = time.strptime(datestr,'%m-%d-%y %H:%M%p')
datelist.append(date)
filelist.append(col[3])
combo = zip(datelist,filelist)
who = dict(combo)
for key in sorted(who.iterkeys(),reverse=True):
print "%s: %s" % (key,who[key])
filename = who[key]
print "file to download is %s" % filename
try:
f.retrbinary('RETR %s' % filename,open(filename,'wb').write)
except ftplib.err_perm:
print "Error: cannot read file %s" % filename
os.unlink(filename)
else:
print "***Downloaded*** %s " % filename
return
f.quit()
return
一个问题是,是否可以从字典中检索第一个元素？我在这里做的是for循环只运行一次并退出,从而给我第一个排序的值,这很好,但我不认为这样做是一个好习惯..
解决方法
如果你在列表中有
time.struct_time(
strptime将给你这个)的所有日期,那么你所要做的就是对列表进行排序.
这是一个例子：
#!/usr/bin/python
import time
dates = [
"Jan 16 18:35 2012","Aug 16 21:14 2012","Dec 05 22:27 2012","Jan 22 19:42 2012","Jan 24 00:49 2012","Dec 15 22:41 2012","Dec 13 01:41 2012","Dec 24 01:23 2012","Jan 21 00:35 2012","Jan 16 18:35 2012",]
def main():
datelist = []
for date in dates:
date = time.strptime(date,'%b %d %H:%M %Y')
datelist.append(date)
print datelist
datelist.sort()
print datelist
if __name__ == '__main__':
main()