(Merge 3.4) Issue #23881: urllib.request.ftpwrapper constructor now closes the

socket if the FTP connection failed to fix a ResourceWarning.

Lib/urllib/request.py

@@ -2255,7 +2255,11 @@ class ftpwrapper:
         self.timeout = timeout
         self.refcount = 0
         self.keepalive = persistent
+        try:
             self.init()
+        except:
+            self.close()
+            raise
 
     def init(self):
         import ftplib

Misc/NEWS

@@ -19,6 +19,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #23881: urllib.request.ftpwrapper constructor now closes the socket if
+  the FTP connection failed to fix a ResourceWarning.
+
 - Issue #23853: :meth:`socket.socket.sendall` does no more reset the socket
   timeout each time data is sent successfuly. The socket timeout is now the
   maximum total duration to send all data.