Python中的FTP通信模块ftplib的用法整理

from ftplib import FTP #加载ftp模块
ftp=FTP() #设置变量
ftp.set_debuglevel(2) #打开调试级别2，显示详细信息
ftp.connect("IP","port") #连接的ftp sever和端口
ftp.login("user","password")#连接的用户名，密码
print ftp.getwelcome() #打印出欢迎信息
ftp.cmd("xxx/xxx") #更改远程目录
bufsize=1024 #设置的缓冲区大小
filename="filename.txt" #需要下载的文件
file_handle=open(filename,"wb").write #以写模式在本地打开文件
ftp.retrbinaly("RETR filename.txt",file_handle,bufsize) #接收服务器上文件并写入本地文件
ftp.set_debuglevel(0) #关闭调试模式
ftp.quit #退出ftp

ftp.cwd(pathname) #设置FTP当前操作的路径
ftp.dir() #显示目录下文件信息
ftp.nlst() #获取目录下的文件
ftp.mkd(pathname) #新建远程目录
ftp.pwd() #返回当前所在位置
ftp.rmd(dirname) #删除远程目录
ftp.delete(filename) #删除远程文件
ftp.rename(fromname, toname)#将fromname修改名称为toname。
ftp.storbinaly("STOR filename.txt",file_handel,bufsize) #上传目标文件
ftp.retrbinary("RETR filename.txt",file_handel,bufsize)#下载FTP文件

import socket
from ftplib import FTP
ftp_server='xx.xx.xx.xx'
ftp_user='xxxxx'
ftp_password='xxxxx'
ftp_backup_dir='backup'
 
newday = date.today()  #获取今天的日期
oldday = date.today()-timedelta(5)  #获得5天前的日期
newfile = '/home/backup/' + 'backup_data_' + str(newday.year) + '.' + str(newday.month) + '.' + str(newday.day) + '.zip'  #本次备份文件名(绝对路径)
oldfile = '/home/backup/' + 'backup_data_' + str(oldday.year) + '.' + str(oldday.month) + '.' + str(oldday.day) + '.zip'  #5天前备份的文件名(绝对路径)
 
def upload():
  socket.setdefaulttimeout(60)  #超时FTP时间设置为60秒
  ftp = FTP(ftp_server)
  print("login ftp...")
  try:
    ftp.login(ftp_user, ftp_password)
    print(ftp.getwelcome())  #获得欢迎信息
 
    try:
      if ftp_backup_dir in ftp.nlst():
        print("found backup folder in ftp server, upload processing.")
      else:
        print("don't found backup folder in ftp server, try to build it.")
        ftp.mkd(ftp_backup_dir)
    except:
      print("the folder" + ftp_backup_dir + "doesn't exits and can't be create!")
      sys.exit()
  except:
    print("ftp login failed.exit.")
    sys.exit()
  ftp.cwd(ftp_backup_dir)  #设置FTP路径
 
  print("upload data...")
  try:
    ftp.storbinary('STOR ' + os.path.basename(newfile), open(newfile,'rb'), 1024)  #上传备份文件
  except:
    print("upload failed. check your permission.")
  
  print("delte old file...")
  try:
    ftp.delete(os.path.basename(oldfile))  #删除5天前的备份文件
  except:
    print("the old file in ftp doesn't exists, jumped.")
 
  print("ftp upload successful.exit...")
  ftp.quit()
 
if __name__== '__main__':
  upload()