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.. currentmodule:: asyncio
.. _asyncio-exceptions:
==========
Exceptions
==========
**Source code:** :source:`Lib/asyncio/exceptions.py`
----------------------------------------------------
.. exception:: TimeoutError
A deprecated alias of :exc:`TimeoutError`,
raised when the operation has exceeded the given deadline.
.. versionchanged:: 3.11
This class was made an alias of :exc:`TimeoutError`.
.. exception:: CancelledError
The operation has been cancelled.
This exception can be caught to perform custom operations
when asyncio Tasks are cancelled. In almost all situations the
exception must be re-raised.
.. versionchanged:: 3.8
:exc:`CancelledError` is now a subclass of :class:`BaseException` rather than :class:`Exception`.
.. exception:: InvalidStateError
Invalid internal state of :class:`Task` or :class:`Future`.
Can be raised in situations like setting a result value for a
*Future* object that already has a result value set.
.. exception:: SendfileNotAvailableError
The "sendfile" syscall is not available for the given
socket or file type.
A subclass of :exc:`RuntimeError`.
.. exception:: IncompleteReadError
The requested read operation did not complete fully.
Raised by the :ref:`asyncio stream APIs<asyncio-streams>`.
This exception is a subclass of :exc:`EOFError`.
.. attribute:: expected
The total number (:class:`int`) of expected bytes.
.. attribute:: partial
A string of :class:`bytes` read before the end of stream was reached.
.. exception:: LimitOverrunError
Reached the buffer size limit while looking for a separator.
Raised by the :ref:`asyncio stream APIs <asyncio-streams>`.
.. attribute:: consumed
The total number of to be consumed bytes.
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