修改coding代码扫描警告

sf_machine_connect/models/ftp_operate.py

@@ -1,5 +1,4 @@
 # -*- coding: utf-8 -*-
-import os
 import logging
 from ftplib import FTP
 
@@ -20,7 +19,6 @@ class FTP_P(FTP):
         cmd = 'LIST'
         templist = []
         tempdic = {}
-        func = None
         if args[-1:] and type(args[-1]) != type(''):
             args, func = args[:-1], args[-1]
         for arg in args: