example: Minor reorganization

python/example.py

@@ -70,6 +70,28 @@ async def receive(self):
         return item
 
 
+#
+# Helper functions
+#
+
+
+def pphex(thing):
+    """Pretty print an object with bytes as hex strings"""
+
+    def hexlify(thing):
+        if isinstance(thing, bytes):
+            return thing.hex()
+        if isinstance(thing, dict):
+            return {k: hexlify(v) for k, v in thing.items()}
+        if hasattr(thing, "_asdict"):  # NamedTuple
+            return hexlify(thing._asdict())
+        if isinstance(thing, List):
+            return [hexlify(v) for v in thing]
+        return thing
+
+    pprint.pp(hexlify(thing))
+
+
 #
 # Protocol parties
 #
@@ -269,22 +291,5 @@ def main():
     print(recovery_data.hex())
 
 
-def pphex(thing):
-    """Pretty print an object with bytes as hex strings"""
-
-    def hexlify(thing):
-        if isinstance(thing, bytes):
-            return thing.hex()
-        if isinstance(thing, dict):
-            return {k: hexlify(v) for k, v in thing.items()}
-        if hasattr(thing, "_asdict"):  # NamedTuple
-            return hexlify(thing._asdict())
-        if isinstance(thing, List):
-            return [hexlify(v) for v in thing]
-        return thing
-
-    pprint.pp(hexlify(thing))
-
-
 if __name__ == "__main__":
     sys.exit(main())