More _check_in_list.

anntzer · anntzer · commit 5e5bbdc00013 · 2019-07-17T16:03:52.000+02:00
diff --git a/lib/matplotlib/backends/backend_ps.py b/lib/matplotlib/backends/backend_ps.py
@@ -849,11 +849,7 @@ def _print_ps(self, outfile, format, *args,
         if papertype is None:
             papertype = rcParams['ps.papersize']
         papertype = papertype.lower()
-        if papertype == 'auto':
-            pass
-        elif papertype not in papersize:
-            raise RuntimeError('%s is not a valid papertype. Use one of %s' %
-                               (papertype, ', '.join(papersize)))
+        cbook._check_in_list(['auto', *papersize], papertype=papertype)
 
         orientation = orientation.lower()
         cbook._check_in_list(['landscape', 'portrait'],
