The path may not always be a true path for stacktraces.

debug_toolbar/utils.py

@@ -72,10 +72,17 @@ def render_stacktrace(trace):
     show_locals = dt_settings.get_config()["ENABLE_STACKTRACES_LOCALS"]
     html = ""
     for abspath, lineno, func, code, locals_ in trace:
-        directory, filename = abspath.rsplit(os.path.sep, 1)
+        if os.path.sep in abspath:
+            directory, filename = abspath.rsplit(os.path.sep, 1)
+            # We want the separator to appear in the UI so add it back.
+            directory += os.path.sep
+        else:
+            # abspath could be something like "<frozen importlib._bootstrap>"
+            directory = ""
+            filename = abspath
         html += format_html(
             (
-                '<span class="djdt-path">{}/</span>'
+                '<span class="djdt-path">{}</span>'
                 + '<span class="djdt-file">{}</span> in'
                 + ' <span class="djdt-func">{}</span>'
                 + '(<span class="djdt-lineno">{}</span>)\n'

tests/test_utils.py

@@ -1,6 +1,6 @@
 import unittest
 
-from debug_toolbar.utils import get_name_from_obj
+from debug_toolbar.utils import get_name_from_obj, render_stacktrace
 
 
 class GetNameFromObjTestCase(unittest.TestCase):
@@ -21,3 +21,29 @@ class A:
 
         res = get_name_from_obj(A)
         self.assertEqual(res, "tests.test_utils.A")
+
+
+class RenderStacktraceTestCase(unittest.TestCase):
+    def test_importlib_path_issue_1612(self):
+        trace = [
+            ("/server/app.py", 1, "foo", ["code line 1", "code line 2"], {"foo": "bar"})
+        ]
+        result = render_stacktrace(trace)
+        self.assertIn('<span class="djdt-path">/server/</span>', result)
+        self.assertIn('<span class="djdt-file">app.py</span> in', result)
+
+        trace = [
+            (
+                "<frozen importlib._bootstrap>",
+                1,
+                "foo",
+                ["code line 1", "code line 2"],
+                {"foo": "bar"},
+            )
+        ]
+        result = render_stacktrace(trace)
+        self.assertIn('<span class="djdt-path"></span>', result)
+        self.assertIn(
+            '<span class="djdt-file">&lt;frozen importlib._bootstrap&gt;</span> in',
+            result,
+        )