PEP 3151 / issue #12555: reworking the OS and IO exception hierarchy.
diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index a9c31d5..0611bd6 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -23,16 +23,8 @@
# defined in io.py. We don't use real inheritance though, because we don't
# want to inherit the C implementations.
-
-class BlockingIOError(IOError):
-
- """Exception raised when I/O would block on a non-blocking I/O stream."""
-
- def __init__(self, errno, strerror, characters_written=0):
- super().__init__(errno, strerror)
- if not isinstance(characters_written, int):
- raise TypeError("characters_written must be a integer")
- self.characters_written = characters_written
+# Rebind for compatibility
+BlockingIOError = BlockingIOError
def open(file, mode="r", buffering=-1, encoding=None, errors=None,