(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
-        self.init()
+        try:
+            self.init()
+        except:
+            self.close()
+            raise
 
     def init(self):
         import ftplib