[Backport of r56382]

Avoid exception if there's a stray directory inside a Maildir folder.

The Maildir specification doesn't seem to say anything about this
situation, and it can happen if you're keeping a Maildir mailbox in
Subversion (.svn directories) or some similar system.  The patch just
ignores directories in the cur/, new/, tmp/ folders.

1 files changed, 5 insertions, 1 deletions

diff --git a/Lib/mailbox.py b/Lib/mailbox.py
index 3e5d0b4e10..46f41ce802 100755
--- a/Lib/mailbox.py
+++ b/Lib/mailbox.py
@@ -459,7 +459,11 @@ class Maildir(Mailbox):
         """Update table of contents mapping."""
         self._toc = {}
         for subdir in ('new', 'cur'):
-            for entry in os.listdir(os.path.join(self._path, subdir)):
+            subdir_path = os.path.join(self._path, subdir)
+            for entry in os.listdir(subdir_path):
+                p = os.path.join(subdir_path, entry)
+                if os.path.isdir(p):
+                    continue
                 uniq = entry.split(self.colon)[0]
                 self._toc[uniq] = os.path.join(subdir, entry)