.. currentmodule:: asyncio

Exceptions

.. exception:: TimeoutError

 The operation has exceeded the given deadline.

 .. important::
 This exception is different from the builtin :exc:`TimeoutError`
 exception.

.. 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.

 .. important::

 This exception is a subclass of :exc:`Exception`, so it can be
 accidentally suppressed by an overly broad ``try..except`` block::

 try:
 await operation
 except Exception:
 # The cancellation is broken because the *except* block
 # suppresses the CancelledError exception.
 log.log('an error has occurred')

 Instead, the following pattern should be used::

 try:
 await operation
 except asyncio.CancelledError:
 raise
 except Exception:
 log.log('an error has occurred')

.. 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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