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-rw-r--r--Doc/library/os.rst8
1 files changed, 5 insertions, 3 deletions
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 20f3b25..ce19fd26 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -2228,9 +2228,11 @@ features:
If optional argument *topdown* is ``True`` or not specified, the triple for a
directory is generated before the triples for any of its subdirectories
- (directories are generated top-down). If *topdown* is ``False``, the triple for a
- directory is generated after the triples for all of its subdirectories
- (directories are generated bottom-up).
+ (directories are generated top-down). If *topdown* is ``False``, the triple
+ for a directory is generated after the triples for all of its subdirectories
+ (directories are generated bottom-up). No matter the value of *topdown*, the
+ list of subdirectories is retrieved before the tuples for the directory and
+ its subdirectories are generated.
When *topdown* is ``True``, the caller can modify the *dirnames* list in-place
(perhaps using :keyword:`del` or slice assignment), and :func:`walk` will only