Fix issue #16270: urllib may hang when used for retrieving files via FTP by…

Fix issue #16270: urllib may hang when used for retrieving files via FTP by using a context manager.

Lib/urllib/request.py

@@ -2326,13 +2326,7 @@ class ftpwrapper:
         return (ftpobj, retrlen)
 
     def endtransfer(self):
-        if not self.busy:
-            return
         self.busy = 0
-        try:
-            self.ftp.voidresp()
-        except ftperrors():
-            pass
 
     def close(self):
         self.keepalive = False

Misc/NEWS

@@ -43,6 +43,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #16270: urllib may hang when used for retrieving files via FTP by using
+  a context manager.  Patch by Giampaolo Rodola'.
+
 - Issue #16176: Properly identify Windows 8 via platform.platform()
 
 - Issue #16114: The subprocess module no longer provides a misleading error