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.. currentmodule:: asyncio
==========
Exceptions
==========
.. exception:: TimeoutError
The operation has exceeded the given deadline.
.. note::
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 on
when asyncio Tasks are cancelled. In almost all situations the
exception must always be re-raised.
.. note::
This exception is a subclass of :exc:`Exception`, so it can be
accidentally suppressed by ``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 for is not available for the given
socket or file type.
A subclass of :exc:`RuntimeError`.
.. exception:: IncompleteReadError
Incomplete read error.
Raised by :ref:`asyncio streams <asyncio-streams>` APIs.
This exception is a subclass of :exc:`EOFError`.
.. attribute:: expected
Total number (:class:`int`) of expected bytes.
.. attribute:: partial
Read :class:`bytes` string before the end of stream was reached.
.. exception:: LimitOverrunError
Reached the buffer limit while looking for a separator.
Raised by :ref:`asyncio streams <asyncio-streams>` APIs.
.. attribute:: consumed
Total number of to be consumed bytes.
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