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      "description": "Use portend to monitor TCP ports for bound or unbound states.\nFor example, to wait for a port to be occupied, timing out after 3 seconds::\n    portend.occupied('www.google.com', 80, timeout=3)\nOr to wait for a port to be free, timing out after 5 seconds::\n    portend.free('::1', 80, timeout=5)\nThe portend may also be executed directly. If the function succeeds, it\nreturns nothing and exits with a status of 0. If it fails, it prints a\nmessage and exits with a status of 1. For example::\n    python -m portend localhost:31923 free\n    (exits immediately)\n    python -m portend -t 1 localhost:31923 occupied\n    (one second passes)\n    Port 31923 not bound on localhost.\nPortend also exposes a ``find_available_local_port`` for identifying\na suitable port for binding locally::\n    port = portend.find_available_local_port()\n    print(port, \"is available for binding\")\nPortend additionally exposes the lower-level port checking functionality\nin the ``Checker`` class, which currently exposes only one public\nmethod, ``assert_free``::\n    portend.Checker().assert_free('localhost', 31923)\nIf assert_free is passed a host/port combination that is occupied by\na bound listener (i.e. a TCP connection is established to that host/port),\nassert_free will raise a ``PortNotFree`` exception.",
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