Issue #23099: Closing io.BytesIO with exported buffer is rejected now to

prevent corrupting exported buffer.

1 files changed, 7 insertions, 6 deletions

diff --git a/Doc/library/io.rst b/Doc/library/io.rst
index b8dc688..3adf6e9 100644
--- a/Doc/library/io.rst
+++ b/Doc/library/io.rst
@@ -563,7 +563,8 @@ than raw I/O does.
 .. class:: BytesIO([initial_bytes])
 
    A stream implementation using an in-memory bytes buffer.  It inherits
-   :class:`BufferedIOBase`.
+   :class:`BufferedIOBase`.  The buffer is discarded when the
+   :meth:`~IOBase.close` method is called.
 
    The argument *initial_bytes* contains optional initial :class:`bytes` data.
 
@@ -584,7 +585,7 @@ than raw I/O does.
 
       .. note::
          As long as the view exists, the :class:`BytesIO` object cannot be
-         resized.
+         resized or closed.
 
       .. versionadded:: 3.2
 
@@ -592,6 +593,7 @@ than raw I/O does.
 
       Return :class:`bytes` containing the entire contents of the buffer.
 
+
    .. method:: read1()
 
       In :class:`BytesIO`, this is the same as :meth:`read`.
@@ -858,7 +860,8 @@ Text I/O
 
 .. class:: StringIO(initial_value='', newline='\\n')
 
-   An in-memory stream for text I/O.
+   An in-memory stream for text I/O.  The text buffer is discarded when the
+   :meth:`~IOBase.close` method is called.
 
    The initial value of the buffer (an empty string by default) can be set by
    providing *initial_value*.  The *newline* argument works like that of
@@ -870,9 +873,7 @@ Text I/O
 
    .. method:: getvalue()
 
-      Return a ``str`` containing the entire contents of the buffer at any
-      time before the :class:`StringIO` object's :meth:`close` method is
-      called.
+      Return a ``str`` containing the entire contents of the buffer.
 
    Example usage::