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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def pick_free_port():
 """ Picks a free port """

        test_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        test_socket.bind(('127.0.0.1', 0))
        free_port = int(test_socket.getsockname()[1])
        test_socket.close()
        return free_port