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bpo-43933: Show frame.f_lineno as None, rather than -1, if there is no line number. #25717

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Merged
markshannon merged 3 commits into from
Apr 29, 2021
Merged

bpo-43933: Show frame.f_lineno as None, rather than -1, if there is no line number. #25717

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fd6c7d5
Show frame.f_lineno as None, rather than -1, if there is no line number.
markshannon Apr 29, 2021
9bd0186
Add NEWS
markshannon Apr 29, 2021
2752916
Don't recompute line number.
markshannon Apr 29, 2021
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11 changes: 10 additions & 1 deletion Lib/test/test_exceptions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2081,7 +2081,10 @@ def lineno_after_raise(self, f, line):
while t.tb_next:
t = t.tb_next
frame = t.tb_frame
self.assertEqual(frame.f_lineno-frame.f_code.co_firstlineno, line)
if line is None:
self.assertEqual(frame.f_lineno, line)
else:
self.assertEqual(frame.f_lineno-frame.f_code.co_firstlineno, line)

def test_lineno_after_raise_simple(self):
def simple():
Expand Down Expand Up @@ -2153,6 +2156,12 @@ def after_with():
pass
self.lineno_after_raise(after_with, 2)

def test_missing_lineno_shows_as_none(self):
def f():
1/0
self.lineno_after_raise(f, 1)
f.__code__ = f.__code__.replace(co_linetable=b'\x04\x80\xff\x80')
self.lineno_after_raise(f, None)

if __name__ == '__main__':
unittest.main()
3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2021-04-29-13-11-44.bpo-43933.mvoV6O.rst
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@@ -0,0 +1,3 @@
If the current position in a frame has no line number then set the f_lineno
attribute to None, instead of -1, to conform to PEP 626. This should not
normally be possible, but might occur in some unusual circumstances.
8 changes: 7 additions & 1 deletion Objects/frameobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,13 @@ PyFrame_GetLineNumber(PyFrameObject *f)
static PyObject *
frame_getlineno(PyFrameObject *f, void *closure)
{
return PyLong_FromLong(PyFrame_GetLineNumber(f));
int lineno = PyFrame_GetLineNumber(f);
if (lineno < 0) {
Py_RETURN_NONE;
}
else {
return PyLong_FromLong(lineno);
}
}

static PyObject *
Expand Down