File: //lib64/python3.6/site-packages/zmq/eventloop/__pycache__/_deprecated.cpython-36.opt-1.pyc
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If you have tornado ≥ 3.0, this is a subclass of tornado's IOLoop,
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The minimal shipped version of tornado's IOLoop does not include
support for concurrent futures - this will only be available if you
have tornado ≥ 3.0.
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After calling this function, tornado's IOLoop.instance() and pyzmq's
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prior to calling this function.
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