fix: find_dotenv fall back to cwd when stack exhausted (#499) - #707
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Walking caller frames for a real filename asserted f_back is not None, which raised AssertionError under python -c / runpy / stdin. Fall back to getcwd() instead, matching the interactive path.
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Summary
Fixes #499. When every caller frame is the dotenv module or a non-existent filename (
python -c, runpy, stdin),find_dotenvassertedframe.f_back is not Noneand raisedAssertionError. Fall back togetcwd()instead (same as the interactive path).Test plan
pytest tests/test_main.py::test_find_dotenv_no_assert_when_stack_exhaustedpython -c "from dotenv import find_dotenv; print(find_dotenv())"from a directory containing.envno longer AssertionErrors