gh-62948: IOBase finalizer logs close() errors (#105104)

Lib/_pyio.py

@@ -33,11 +33,8 @@
 # Rebind for compatibility
 BlockingIOError = BlockingIOError
 
-# Does io.IOBase finalizer log the exception if the close() method fails?
-# The exception is ignored silently by default in release build.
-_IOBASE_EMITS_UNRAISABLE = (hasattr(sys, "gettotalrefcount") or sys.flags.dev_mode)
 # Does open() check its 'errors' argument?
-_CHECK_ERRORS = _IOBASE_EMITS_UNRAISABLE
+_CHECK_ERRORS = (hasattr(sys, "gettotalrefcount") or sys.flags.dev_mode)
 
 
 def text_encoding(encoding, stacklevel=2):
@@ -416,18 +413,9 @@ def __del__(self):
         if closed:
             return
 
-        if _IOBASE_EMITS_UNRAISABLE:
-            self.close()
-        else:
-            # The try/except block is in case this is called at program
-            # exit time, when it's possible that globals have already been
-            # deleted, and then the close() call might fail.  Since
-            # there's nothing we can do about such failures and they annoy
-            # the end users, we suppress the traceback.
-            try:
-                self.close()
-            except:
-                pass
+        # If close() fails, the caller logs the exception with
+        # sys.unraisablehook. close() must be called at the end at __del__().
+        self.close()
 
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