fix most "scripts"

related: #4754

electrum/scripts/estimate_fee.py

@@ -1,7 +1,29 @@
 #!/usr/bin/env python3
-from . import util
 import json
-from electrum.network import filter_protocol
-peers = filter_protocol(util.get_peers())
-results = util.send_request(peers, 'blockchain.estimatefee', [2])
-print(json.dumps(results, indent=4))
+import asyncio
+from statistics import median
+from numbers import Number
+
+from electrum.network import filter_protocol, Network
+from electrum.util import create_and_start_event_loop, log_exceptions
+
+import util
+
+
+loop, stopping_fut, loop_thread = create_and_start_event_loop()
+network = Network()
+network.start()
+
+@log_exceptions
+async def f():
+    try:
+        peers = await util.get_peers(network)
+        peers = filter_protocol(peers)
+        results = await util.send_request(network, peers, 'blockchain.estimatefee', [2])
+        print(json.dumps(results, indent=4))
+        feerate_estimates = filter(lambda x: isinstance(x, Number), results.values())
+        print(f"median feerate: {median(feerate_estimates)}")
+    finally:
+        stopping_fut.set_result(1)
+
+asyncio.run_coroutine_threadsafe(f(), loop)