Merge pull request matplotlib#3309 from jenshnielsen/close_files_pgf

MNT : Explicitly close read and write of Popen process (latex)

Author: tacaswell

lib/matplotlib/animation.py

@@ -226,6 +226,7 @@ def _args(self):
     def cleanup(self):
         'Clean-up and collect the process used to write the movie file.'
         out, err = self._proc.communicate()
+        self._frame_sink().close()
         verbose.report('MovieWriter -- '
                        'Command stdout:\n%s' % out, level='debug')
         verbose.report('MovieWriter -- '

lib/matplotlib/backends/backend_pgf.py

@@ -342,9 +342,9 @@ def _cleanup(self):
         if not os.path.isdir(self.tmpdir):
             return
         try:
-            self.latex_stdin_utf8.close()
             self.latex.communicate()
-            self.latex.wait()
+            self.latex_stdin_utf8.close()
+            self.latex.stdout.close()
         except:
             pass
         try: