bpo-33375: Get filename for warnings from frame.f_code.co_filename #6622
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This needs fewer fallbacks than looking at
frame.f_globals['__file__']
, it's more consistent with how other pieces of Python (tracebacks, pdb) find code from a frame, and it works better for interactive interpreters like IPython, where many fragments of code share the same global namespace.https://bugs.python.org/issue33375