bpo-6700: Fix inspect.getsourcelines for module level frames/tracebacks (GH-8864)

2 files changed, 18 insertions, 2 deletions

diff --git a/Lib/test/inspect_fodder.py b/Lib/test/inspect_fodder.py
index 711badad84..ff3f0e4b73 100644
--- a/Lib/test/inspect_fodder.py
+++ b/Lib/test/inspect_fodder.py
@@ -74,3 +74,9 @@ class FesteringGob(MalodorousPervert, ParrotDroppings):
 
 async def lobbest(grenade):
     pass
+
+currentframe = inspect.currentframe()
+try:
+    raise Exception()
+except:
+    tb = sys.exc_info()[2]
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index cda8d5cf73..e523dd4063 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -344,7 +344,7 @@ class GetSourceBase(unittest.TestCase):
 
     def sourcerange(self, top, bottom):
         lines = self.source.split("\n")
-        return "\n".join(lines[top-1:bottom]) + "\n"
+        return "\n".join(lines[top-1:bottom]) + ("\n" if bottom else "")
 
     def assertSourceEqual(self, obj, top, bottom):
         self.assertEqual(inspect.getsource(obj),
@@ -527,6 +527,16 @@ class TestRetrievingSourceCode(GetSourceBase):
     def test_getsource_on_code_object(self):
         self.assertSourceEqual(mod.eggs.__code__, 12, 18)
 
+class TestGettingSourceOfToplevelFrames(GetSourceBase):
+    fodderModule = mod
+
+    def test_range_toplevel_frame(self):
+        self.maxDiff = None
+        self.assertSourceEqual(mod.currentframe, 1, None)
+
+    def test_range_traceback_toplevel_frame(self):
+        self.assertSourceEqual(mod.tb, 1, None)
+
 class TestDecorators(GetSourceBase):
     fodderModule = mod2
 
@@ -3870,7 +3880,7 @@ def test_main():
         TestBoundArguments, TestSignaturePrivateHelpers,
         TestSignatureDefinitions, TestIsDataDescriptor,
         TestGetClosureVars, TestUnwrap, TestMain, TestReload,
-        TestGetCoroutineState
+        TestGetCoroutineState, TestGettingSourceOfToplevelFrames
     )
 
 if __name__ == "__main__":