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inspect.getsourcelines() mishandles multi-line generator expressions #137477
Description
Bug report
Bug description:
import inspect
def source_error(*args):
frame = inspect.currentframe()
if frame is None:
return
frame = frame.f_back
if frame is None:
return
print(inspect.getsource(frame))
def demo():
loops = (
None for _ in [0] if source_error(True)
)
list(loops)
demo()Expected output:
def demo():
loops = (
None for _ in [0] if source_error(True)
)
list(loops)
Actual output:
loops = (
CPython versions tested on:
CPython main branch
Operating systems tested on:
Linux
Linked PRs
- gh-137477: Extend regex pattern check in
inspect.findsource#137479 - gh-137477: Fix inspect.getblock() for generator expressions #137488
- [3.14] gh-137477: Fix inspect.getblock() for generator expressions (GH-137488) #137993
- [3.13] gh-137477: Fix inspect.getblock() for generator expressions (GH-137488) #137995
Activity
George-Ogden commentedon Aug 6, 2025
Possibly related to #122981
Introduced in #117025
[-]`inspect.getsourcelines` bug introduced in #117025[/-][+]`inspect.getsourcelines()` Bug[/+]AA-Turner commentedon Aug 6, 2025
cc @gaogaotiantian
pythongh-137477: Fix inspect.getblock() for generator expressions
serhiy-storchaka commentedon Aug 6, 2025
I do not think that restoring that regexp is a correct solution. This method has proven unreliable. And even if it works, it will show the source of the first function or class above the generator expression. It may even not include the source of the generator expression.
I think that the right method is to fix
getblock(), so it will process generator expressions similarly to lambda expressions.George-Ogden commentedon Aug 7, 2025
@serhiy-storchaka I think #137488 is a better solution than #137479
[-]`inspect.getsourcelines()` Bug[/-][+]`inspect.getsourcelines()` mishandles multi-line generator expressions[/+]gh-137477: Fix inspect.getblock() for generator expressions (GH-137488)
pythongh-137477: Fix inspect.getblock() for generator expressions (py…
[3.13] pythongh-137477: Fix inspect.getblock() for generator expressi…
[3.13] gh-137477: Fix inspect.getblock() for generator expressions (G…
[3.14] gh-137477: Fix inspect.getblock() for generator expressions (G…