Use single bytestring

maxnoe · maxnoe · commit 8bfe11e0c1ba · 2018-02-21T09:54:15.000+01:00
diff --git a/lib/matplotlib/backends/backend_pgf.py b/lib/matplotlib/backends/backend_pgf.py
@@ -1108,7 +1108,7 @@ def close(self):
         Finalize this object, running LaTeX in a temporary directory
         and moving the final pdf file to `filename`.
         """
-        self._file.write(r'\end{document}'.encode('utf-8') + b'\n')
+        self._file.write(rb'\end{document}\n')
         self._file.close()
 
         if self._n_figures > 0:
