close the file even if an exception occurs #5536

Lib/urllib.py

@@ -233,6 +233,7 @@ class URLopener:
             except IOError, msg:
                 pass
         fp = self.open(url, data)
+        try:
             headers = fp.info()
             if filename:
                 tfp = open(filename, 'wb')
@@ -246,6 +247,7 @@ class URLopener:
                 (fd, filename) = tempfile.mkstemp(suffix)
                 self.__tempfiles.append(filename)
                 tfp = os.fdopen(fd, 'wb')
+            try:
                 result = filename, headers
                 if self.tempcache is not None:
                     self.tempcache[url] = result
@@ -266,8 +268,10 @@ class URLopener:
                     blocknum += 1
                     if reporthook:
                         reporthook(blocknum, bs, size)
-        fp.close()
+            finally:
                 tfp.close()
+        finally:
+            fp.close()
         del fp
         del tfp
 

Misc/NEWS

@@ -188,6 +188,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #5536: urllib.urlretrieve makes sure to close the file it's writing to
+  even if an exception occurs.
+
 - Issue #5381: Added object_pairs_hook to the json module.  This allows
   OrderedDicts to be built by the decoder.