Issue #4604: Some objects of the I/O library could still be used after
having been closed (for instance, a read() call could return some
previously buffered data). Patch by Dmitry Vasiliev.
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index af5b6f4..e8bba86 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -1324,6 +1324,45 @@
f.close()
g.close()
+ def test_io_after_close(self):
+ for kwargs in [
+ {"mode": "w"},
+ {"mode": "wb"},
+ {"mode": "w", "buffering": 1},
+ {"mode": "w", "buffering": 2},
+ {"mode": "wb", "buffering": 0},
+ {"mode": "r"},
+ {"mode": "rb"},
+ {"mode": "r", "buffering": 1},
+ {"mode": "r", "buffering": 2},
+ {"mode": "rb", "buffering": 0},
+ {"mode": "w+"},
+ {"mode": "w+b"},
+ {"mode": "w+", "buffering": 1},
+ {"mode": "w+", "buffering": 2},
+ {"mode": "w+b", "buffering": 0},
+ ]:
+ f = io.open(support.TESTFN, **kwargs)
+ f.close()
+ self.assertRaises(ValueError, f.flush)
+ self.assertRaises(ValueError, f.fileno)
+ self.assertRaises(ValueError, f.isatty)
+ self.assertRaises(ValueError, f.__iter__)
+ if hasattr(f, "peek"):
+ self.assertRaises(ValueError, f.peek, 1)
+ self.assertRaises(ValueError, f.read)
+ if hasattr(f, "read1"):
+ self.assertRaises(ValueError, f.read1, 1024)
+ if hasattr(f, "readinto"):
+ self.assertRaises(ValueError, f.readinto, bytearray(1024))
+ self.assertRaises(ValueError, f.readline)
+ self.assertRaises(ValueError, f.readlines)
+ self.assertRaises(ValueError, f.seek, 0)
+ self.assertRaises(ValueError, f.tell)
+ self.assertRaises(ValueError, f.truncate)
+ self.assertRaises(ValueError, f.write, "")
+ self.assertRaises(ValueError, f.writelines, [])
+
def test_main():
support.run_unittest(IOTest, BytesIOTest, StringIOTest,