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gh-85524: Raise "UnsupportedOperation" on FileIO.readall (#141214)

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io.UnsupportedOperation is a subclass of OSError and recommended by
io.IOBase for this case; matches other read methods on io.FileIO.
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Cody Maloney 2025-11-12 01:37:48 -08:00 • committed by GitHub
parent 909f76dab9
commit 6f988b08d1
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4 changed files with 23 additions and 8 deletions
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Lib/test/test_io/test_general.py
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@ -125,6 +125,7 @@ def test_invalid_operations(self):
self.assertRaises(exc, fp.readline)
with self.open(os_helper.TESTFN, "wb", buffering=0) as fp:
self.assertRaises(exc, fp.read)
self.assertRaises(exc, fp.readall)
self.assertRaises(exc, fp.readline)
with self.open(os_helper.TESTFN, "rb", buffering=0) as fp:
self.assertRaises(exc, fp.write, b"blah")