mirror of https://github.com/python/cpython.git
89 lines
2.0 KiB
ReStructuredText
89 lines
2.0 KiB
ReStructuredText
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.. currentmodule:: asyncio
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==========
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Exceptions
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==========
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.. exception:: TimeoutError
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The operation has exceeded the given deadline.
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.. note::
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This exception is different from the builtin :exc:`TimeoutError`
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exception.
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.. exception:: CancelledError
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The operation has been cancelled.
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This exception can be caught to perform custom operations on
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when asyncio Tasks are cancelled. In almost all situations the
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exception must always be re-raised.
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.. note::
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This exception is a subclass of :exc:`Exception`, so it can be
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accidentally suppressed by ``try..except`` block::
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try:
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await operation
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except Exception:
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# The cancellation is broken because the *except* block
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# suppresses the CancelledError exception.
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log.log('an error has occurred')
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Instead, the following pattern should be used::
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try:
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await operation
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except asyncio.CancelledError:
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raise
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except Exception:
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log.log('an error has occurred')
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.. exception:: InvalidStateError
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Invalid internal state of :class:`Task` or :class:`Future`.
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Can be raised in situations like setting a result value for a
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*Future* object that already has a result value set.
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.. exception:: SendfileNotAvailableError
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The "sendfile" syscall for is not available for the given
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socket or file type.
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A subclass of :exc:`RuntimeError`.
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.. exception:: IncompleteReadError
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Incomplete read error.
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Raised by :ref:`asyncio streams <asyncio-streams>` APIs.
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This exception is a subclass of :exc:`EOFError`.
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.. attribute:: expected
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Total number (:class:`int`) of expected bytes.
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.. attribute:: partial
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Read :class:`bytes` string before the end of stream was reached.
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.. exception:: LimitOverrunError
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Reached the buffer limit while looking for a separator.
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Raised by :ref:`asyncio streams <asyncio-streams>` APIs.
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.. attribute:: consumed
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Total number of to be consumed bytes.
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