Show user traceback for errors raised in the debug console. Fixes #328

src/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_comm.py

@@ -85,6 +85,7 @@
 from _pydevd_bundle.pydevd_constants import ForkSafeLock, NULL
 from _pydevd_bundle.pydevd_daemon_thread import PyDBDaemonThread
 from _pydevd_bundle.pydevd_thread_lifecycle import pydevd_find_thread_by_id, resume_threads
+from _pydevd_bundle.pydevd_dont_trace_files import PYDEV_FILE
 try:
     from urllib import quote_plus, unquote_plus  # @UnresolvedImport
 except:
@@ -953,8 +954,32 @@ def __create_frame():
         if try_exec:
             try:
                 pydevd_vars.evaluate_expression(py_db, frame, expression, is_exec=True)
-            except (Exception, KeyboardInterrupt) as ex:
-                err = ''.join(traceback.format_exception_only(type(ex), ex))
+            except (Exception, KeyboardInterrupt):
+                try:
+                    exc, exc_type, initial_tb = sys.exc_info()
+                    tb = initial_tb
+
+                    # Show the traceback without pydevd frames.
+                    temp_tb = tb
+                    while temp_tb:
+                        if py_db.get_file_type(temp_tb.tb_frame) == PYDEV_FILE:
+                            tb = temp_tb.tb_next
+                        temp_tb = temp_tb.tb_next
+
+                    if tb is None:
+                        tb = initial_tb
+                    err = ''.join(traceback.format_exception(exc, exc_type, tb))
+
+                    # Make sure we don't keep references to them.
+                    exc = None
+                    exc_type = None
+                    tb = None
+                    temp_tb = None
+                    initial_tb = None
+                except:
+                    err = '<Internal error - unable to get traceback when evaluating expression>'
+                    pydev_log.exception(err)
+
                 # Currently there is an issue in VSC where returning success=false for an
                 # eval request, in repl context, VSC does not show the error response in
                 # the debug console. So return the error message in result as well.

src/debugpy/_vendored/pydevd/tests_python/test_debugger_json.py

@@ -2600,6 +2600,51 @@ def test_evaluate_failures(case_setup):
         writer.finished_ok = True
 
 
+def test_evaluate_exception_trace(case_setup, pyfile):
+
+    @pyfile
+    def exception_trace_file():
+
+        class A(object):
+
+            def __init__(self, a):
+                pass
+
+        def method():
+            A()
+
+        def method2():
+            method()
+
+        def method3():
+            method2()
+
+        print('TEST SUCEEDED')  # Break here
+
+    with case_setup.test_file(exception_trace_file) as writer:
+        json_facade = JsonFacade(writer)
+        json_facade.write_launch(justMyCode=False)
+
+        json_facade.write_set_breakpoints(writer.get_line_index_with_content('Break here'))
+        json_facade.write_make_initial_run()
+
+        json_hit = json_facade.wait_for_thread_stopped()
+
+        exec_response = json_facade.evaluate('method3()', json_hit.frame_id, 'repl', success=False)
+        assert 'pydevd' not in exec_response.message  # i.e.: don't show pydevd in the trace
+        assert 'method3' in exec_response.message
+        assert 'method2' in exec_response.message
+
+        exec_response = json_facade.evaluate('method2()', json_hit.frame_id, 'repl', success=False)
+        assert 'pydevd' not in exec_response.message
+        assert 'method3' not in exec_response.message
+        assert 'method2' in exec_response.message
+
+        json_facade.write_continue()
+
+        writer.finished_ok = True
+
+
 @pytest.mark.parametrize('max_frames', ['default', 'all', 10])  # -1 = default, 0 = all, 10 = 10 frames
 def test_exception_details(case_setup, max_frames):
     with case_setup.test_file('_debugger_case_large_exception_stack.py') as writer: