Shift the pipe-using code into an else block, then close the pipe

in finally. Removes two ResourceWarnings.

Lib/uuid.py

@@ -373,10 +373,13 @@ def _ipconfig_getnode():
             pipe = os.popen(os.path.join(dir, 'ipconfig') + ' /all')
         except IOError:
             continue
+        else:
             for line in pipe:
                 value = line.split(':')[-1].strip().lower()
                 if re.match('([0-9a-f][0-9a-f]-){5}[0-9a-f][0-9a-f]', value):
                     return int(value.replace('-', ''), 16)
+        finally:
+            pipe.close()
 
 def _netbios_getnode():
     """Get the hardware address on Windows using NetBIOS calls.