Fix import statements and improve error handling in examples

examples/advanced/network_discover.py

@@ -19,6 +19,7 @@ try:
 except ImportError:
     # Fallbacks if utilities are missing - use minimal network discovery
     import socket
+
     def get_available_interfaces(port: int, protocol: str = "tcp"):
         # Try to get local network interfaces, fallback to loopback
         addrs = []
@@ -28,7 +29,7 @@ except ImportError:
             local_ip = socket.gethostbyname(hostname)
             if local_ip != "127.0.0.1":
                 addrs.append(Multiaddr(f"/ip4/{local_ip}/{protocol}/{port}"))
-        except exception:
+        except Exception:
             pass
         # Always include loopback as fallback
         addrs.append(Multiaddr(f"/ip4/127.0.0.1/{protocol}/{port}"))

examples/doc-examples/example_encryption_insecure.py

@@ -8,7 +8,7 @@ from libp2p import (
 from libp2p.crypto.secp256k1 import (
     create_new_key_pair,
 )
-from libp2p.security.insecure.transport import PLAINTEXT_PROTOCOL_ID, Transport
+from libp2p.security.insecure.transport import PLAINTEXT_PROTOCOL_ID, InsecureTransport
 from libp2p.utils.address_validation import (
     get_available_interfaces,
     get_optimal_binding_address,
@@ -21,7 +21,7 @@ async def main():
     key_pair = create_new_key_pair(secret)
 
     # Create an insecure transport (not recommended for production)
-    insecure_transport = Transport(
+    insecure_transport = InsecureTransport(
         # local_key_pair: The key pair used for libp2p identity
         local_key_pair=key_pair,
         # secure_bytes_provider: Optional function to generate secure random bytes

examples/doc-examples/example_peer_discovery.py

@@ -1,5 +1,6 @@
 import secrets
 
+from multiaddr import Multiaddr
 import trio
 
 from libp2p import (
@@ -66,7 +67,7 @@ async def main():
 
         for addr in bootstrap_list:
             try:
-                peer_info = info_from_p2p_addr(multiaddr.Multiaddr(addr))
+                peer_info = info_from_p2p_addr(Multiaddr(addr))
                 await host.connect(peer_info)
                 print(f"Connected to {peer_info.peer_id.to_string()}")
             except Exception as e:

examples/doc-examples/example_quic_transport.py

@@ -30,6 +30,7 @@ async def main():
     for addr in listen_addrs:
         addr_str = str(addr).replace("/tcp/", "/udp/") + "/quic-v1"
         from multiaddr import Multiaddr
+
         quic_addrs.append(Multiaddr(addr_str))
 
     optimal_addr = get_optimal_binding_address(port, protocol="udp")

examples/echo/echo_quic.py

@@ -93,7 +93,8 @@ async def run_server(port: int, seed: int | None = None) -> None:
             # Use optimal address for the client command
             optimal_tcp = get_optimal_binding_address(port)
             optimal_quic_str = str(optimal_tcp).replace("/tcp/", "/udp/") + "/quic"
-            optimal_quic_with_peer = f"{optimal_quic_str}/p2p/{host.get_id().to_string()}"
+            peer_id = host.get_id().to_string()
+            optimal_quic_with_peer = f"{optimal_quic_str}/p2p/{peer_id}"
             print(
                 f"\nRun this from the same folder in another console:\n\n"
                 f"python3 ./examples/echo/echo_quic.py -d {optimal_quic_with_peer}\n"