Fix file descriptor not closed (prometheus#269)

geobeau · brian-brazil · commit 2783ff82991a · 2018-04-12T14:22:22.000+01:00
Signed-off-by: Geoffrey Beausire &lt;g.beausire@criteo.com&gt;
diff --git a/prometheus_client/core.py b/prometheus_client/core.py
@@ -426,6 +426,8 @@ def write_value(self, key, value):
 
     def close(self):
         if self._f:
+            self._m.close()
+            self._m = None
             self._f.close()
             self._f = None
 
