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import socket
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from contextlib import closing
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def find_free_port():
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with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as s:
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try:
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s.bind(('', 0))
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s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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except Exception:
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return None
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else:
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return s.getsockname()[1]
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