scripts: add "quick_start" to showcase some basic functionality

electrum/scripts/quick_start.py

@@ -0,0 +1,40 @@
+import os
+
+from electrum.simple_config import SimpleConfig
+from electrum import constants
+from electrum.daemon import Daemon
+from electrum.storage import WalletStorage
+from electrum.wallet import Wallet
+from electrum.commands import Commands
+
+
+config = SimpleConfig({"testnet": True})  # to use ~/.electrum/testnet as datadir
+constants.set_testnet()  # to set testnet magic bytes
+daemon = Daemon(config, listen_jsonrpc=False)
+network = daemon.network
+assert network.asyncio_loop.is_running()
+
+command_runner = Commands(config, wallet=None, network=network)
+
+# get wallet on disk
+wallet_dir = os.path.dirname(config.get_wallet_path())
+wallet_path = os.path.join(wallet_dir, "test_wallet")
+if not os.path.exists(wallet_path):
+    config.set_key('wallet_path', wallet_path)
+    command_runner.create(segwit=True)
+
+# open wallet
+storage = WalletStorage(wallet_path)
+wallet = Wallet(storage)
+wallet.start_network(network)
+
+# you can use ~CLI commands by accessing command_runner
+command_runner.wallet = wallet
+print("balance", command_runner.getbalance())
+print("addr",    command_runner.getunusedaddress())
+print("gettx",   command_runner.gettransaction("bd3a700b2822e10a034d110c11a596ee7481732533eb6aca7f9ca02911c70a4f"))
+
+# but you might as well interact with the underlying methods directly
+print("balance", wallet.get_balance())
+print("addr",    wallet.get_unused_address())
+print("gettx",   network.run_from_another_thread(network.get_transaction("bd3a700b2822e10a034d110c11a596ee7481732533eb6aca7f9ca02911c70a4f")))