Print python exception tracebacks

src/python/app.py

@@ -2,14 +2,15 @@ import asyncio
 import logging as log
 import signal
 import sys
+import traceback
 from concurrent.futures import Future
 from operator import attrgetter
 from threading import Thread
 from typing import Coroutine, Sequence
 
+import nio
 from appdirs import AppDirs
 
-import nio
 import pyotherside
 
 from . import __about__
@@ -62,14 +63,15 @@ class App:
 
     def _call_coro(self, coro: Coroutine, uuid: str) -> None:
         def on_done(future: Future) -> None:
+            result = exception = trace = None
+
             try:
                 result = future.result()
-                exception = None
             except Exception as err:
-                result    = None
                 exception = err
+                trace     = traceback.format_exc().rstrip()
 
-            CoroutineDone(uuid, result, exception)
+            CoroutineDone(uuid, result, exception, trace)
 
         self.run_in_loop(coro).add_done_callback(on_done)
 

src/python/pyotherside_events.py

@@ -50,6 +50,7 @@ class CoroutineDone(PyOtherSideEvent):
     uuid:   str                    = field()
     result: Any                    = None
     exception: Optional[Exception] = None
+    traceback: Optional[str]       = None
 
 
 @dataclass

src/qml/event_handlers.js

@@ -13,7 +13,7 @@ function onAlertRequested() {
 }
 
 
-function onCoroutineDone(uuid, result, error) {
+function onCoroutineDone(uuid, result, error, traceback) {
     let onSuccess = py.pendingCoroutines[uuid].onSuccess
     let onError   = py.pendingCoroutines[uuid].onError
 
@@ -22,8 +22,8 @@ function onCoroutineDone(uuid, result, error) {
         let args = py.getattr(error, "args")
 
         onError ?
-        onError(type, args, error) :
-        console.error(uuid + ": " + type + ": " + args)
+            onError(type, args, error, traceback) :
+            console.error("python:\n" + traceback)
 
     } else if (onSuccess) { onSuccess(result) }