diff -r 1ed74994c3e3 Lib/urllib.py
--- a/Lib/urllib.py	Fri Jun 24 11:39:57 2016 -0700
+++ b/Lib/urllib.py	Sat Sep 17 18:22:58 2016 +0500
@@ -548,6 +548,8 @@
             if not key in self.ftpcache:
                 self.ftpcache[key] = \
                     ftpwrapper(user, passwd, host, port, dirs)
+            else:
+                self.ftpcache[key].clear_buffer()
             if not file: type = 'D'
             else: type = 'I'
             for attr in attrs:
@@ -952,6 +954,13 @@
         except ftperrors():
             pass
 
+    def clear_buffer(self):
+        # Get pending responses from server if any
+        try:
+            self.ftp.getresp()
+        except ftperrors():
+            pass
+
 class addbase:
     """Base class for addinfo and addclosehook."""