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Expand file tree Collapse file tree Original file line number Diff line number Diff line change @@ -4595,6 +4595,15 @@ mod _io {
45954595 true
45964596 }
45974597
4598+ #[ pymethod]
4599+ fn flush ( & self , vm : & VirtualMachine ) -> PyResult < ( ) > {
4600+ if self . closed . load ( ) {
4601+ Err ( io_closed_error ( vm) )
4602+ } else {
4603+ Ok ( ( ) )
4604+ }
4605+ }
4606+
45984607 #[ pymethod]
45994608 fn write ( & self , data : ArgBytesLike , vm : & VirtualMachine ) -> PyResult < u64 > {
46004609 let mut buffer = self . try_resizable ( vm) ?;
Original file line number Diff line number Diff line change @@ -74,10 +74,35 @@ def test_06():
7474 assert f .readline () == b""
7575
7676
77+ def test_07 ():
78+ """
79+ Tests that flush() returns None when the file is open,
80+ and raises ValueError when the file is closed.
81+ CPython reference: Modules/_io/bytesio.c:325-335
82+ """
83+ f = BytesIO (b"Test String 7" )
84+
85+ # flush() on an open BytesIO returns None
86+ assert f .flush () is None
87+
88+ # flush() is defined directly on BytesIO (not just inherited)
89+ assert "flush" in BytesIO .__dict__
90+
91+ f .close ()
92+
93+ # flush() on a closed BytesIO raises ValueError
94+ try :
95+ f .flush ()
96+ assert False , "Expected ValueError not raised"
97+ except ValueError :
98+ pass
99+
100+
77101if __name__ == "__main__" :
78102 test_01 ()
79103 test_02 ()
80104 test_03 ()
81105 test_04 ()
82106 test_05 ()
83107 test_06 ()
108+ test_07 ()
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