gremlin-python/src/main/python/gremlin_python/driver/exceptions.py

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class ReadTimeoutError(TimeoutError):
    """Raised when the client-side read timeout elapses while waiting for response
    data from the server.

    Subclasses the builtin :class:`TimeoutError` so it can be caught with
    ``except TimeoutError`` without depending on the underlying transport.

    This driver-owned type exists only because the driver is currently synchronous and
    should not surface the transport's asyncio/aiohttp timeout types. Once gremlin-python
    is fully asynchronous this should be reverted to raising ``asyncio.TimeoutError``
    directly. See TINKERPOP-2774: https://issues.apache.org/jira/browse/TINKERPOP-2774
    """