Simple script to run a single demo Ursula.

examples/run_single_demo_ursula.py

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+from click.testing import CliRunner
+from nucypher.cli.main import nucypher_cli
+import sys
+
+from nucypher.utilities.sandbox.constants import select_test_port
+
+click_runner = CliRunner()
+
+port = select_test_port()
+
+try:
+    learner_port = sys.argv[1]
+except IndexError:
+    learner_port = None
+
+args = ['ursula', 'run',
+        '--federated-only', '--rest-port', port,
+        '--dev', '--debug']
+
+if learner_port:
+        args.extend(['--teacher-uri', 'https://127.0.0.1:{}'.format(int(learner_port))])
+
+nucypher_cli.main(args=args or (), prog_name="nucypher-cli")