Avoid recursion for subclasses of str that are also "PathLike"

Nodd · Nodd · commit f6a9f9894cf4 · 2018-05-25T11:03:31.000+02:00
This is the case for path.py for example. Fixes gh-11306
diff --git a/lib/matplotlib/cbook/__init__.py b/lib/matplotlib/cbook/__init__.py
@@ -452,9 +452,7 @@ def to_filehandle(fname, flag='rU', return_opened=False, encoding=None):
     read/write flag for :func:`file`
     """
     if isinstance(fname, getattr(os, "PathLike", ())):
-        return to_filehandle(
-            os.fspath(fname),
-            flag=flag, return_opened=return_opened, encoding=encoding)
+        fname = os.fspath(fname)
     if isinstance(fname, str):
         if fname.endswith('.gz'):
             # get rid of 'U' in flag for gzipped files.
