1.修改了创建连接数据库引擎时的方言类型 2.修改了爬取数据的逻辑以及相关的异常分析代码

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2023-12-22 d99d235123d43825f35cdc4c8cb49339d9651056

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Use as a context manager to check that the code inside the ``with``
    block either exits with an exception or executes at least one
    :ref:`checkpoint <checkpoints>`.
 
    Raises:
      AssertionError: if no checkpoint was executed.
 
    Example:
      Check that :func:`trio.sleep` is a checkpoint, even if it doesn't
      block::
 
         with trio.testing.assert_checkpoints():
             await trio.sleep(0)
 
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Use as a context manager to check that the code inside the ``with``
    block does not execute any :ref:`checkpoints <checkpoints>`.
 
    Raises:
      AssertionError: if a checkpoint was executed.
 
    Example:
      Synchronous code never contains any checkpoints, but we can double-check
      that::
 
         send_channel, receive_channel = trio.open_memory_channel(10)
         with trio.testing.assert_no_checkpoints():
             send_channel.send_nowait(None)
 
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