From abd0e78188b0b5d8a8cf143f4a5de51975e064b1 Mon Sep 17 00:00:00 2001
From: kakwok <ka_hei_martin_kwok@alumni.brown.edu>
Date: Thu, 4 Aug 2022 17:03:05 +0200
Subject: [PATCH] Set ReadOnlyDirectory attributes when fSeekKeys == 0 (#660)

* Set ReadOnlyDirectory attributes when fSeekKeys == 0

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Co-authored-by: Martin <ka_hei_martin_kwok@brown.edu>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
---
 src/uproot/reading.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/uproot/reading.py b/src/uproot/reading.py
index 2fe169345..455943c04 100644
--- a/src/uproot/reading.py
+++ b/src/uproot/reading.py
@@ -1405,7 +1405,8 @@ def __init__(self, path, cursor, context, file, parent):
         if self._fSeekKeys == 0:
             self._header_key = None
             self._keys = []
-
+            self._keys_lookup = {}
+            self._len = None
         else:
             keys_start = self._fSeekKeys
             keys_stop = min(keys_start + self._fNbytesKeys + 8, file.fEND)