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-rw-r--r--Doc/library/mmap.rst10
1 files changed, 6 insertions, 4 deletions
diff --git a/Doc/library/mmap.rst b/Doc/library/mmap.rst
index ca09a6a..c8ae7a6 100644
--- a/Doc/library/mmap.rst
+++ b/Doc/library/mmap.rst
@@ -191,11 +191,13 @@ To map anonymous memory, -1 should be passed as the fileno along with the length
changes to the given range of bytes will be flushed to disk; otherwise, the
whole extent of the mapping is flushed.
- **(Windows version)** A nonzero value returned indicates success; zero
- indicates failure.
+ ``None`` is returned to indicate success. An exception is raised when the
+ call failed.
- **(Unix version)** A zero value is returned to indicate success. An
- exception is raised when the call failed.
+ .. versionchanged:: 3.8
+ Previously, a nonzero value was returned on success; zero was returned
+ on error under Windows. A zero value was returned on success; an
+ exception was raised on error under Unix.
.. method:: move(dest, src, count)