filesize: raise ValueError for non-finite bytes in naturalsize#349
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HrachShah wants to merge 3 commits into
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filesize: raise ValueError for non-finite bytes in naturalsize#349HrachShah wants to merge 3 commits into
HrachShah wants to merge 3 commits into
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naturalsize(float('nan')) fell through to int(log(abs(nan), base)) and
raised a confusing 'cannot convert float NaN to integer' from int() on
the suffix exponent, far from the user's call site. naturalsize(+/-inf)
silently rendered as 'inf QB' / '-inf QB', a stringified float pasted in
front of a binary-scaled suffix.
Reject both up front with math.isfinite(bytes_) and a clear
ValueError naming the offending value. Strings like 'inf' / 'NaN' /
'-inf' go through float() first and trip the same check.
Adds 8 new test cases (3 floats + 5 strings) and 2 doctest examples.
for more information, see https://pre-commit.ci
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Blocking and reporting @HrachShah for deleting CI here and python-attrs/attrs#1585 and opening duplicate PRs (#342) and updating that PR while my question. |
This was referenced Jul 9, 2026
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Bug
naturalsize(float('nan'))raisedValueError: cannot convert float NaN to integerfrom inside theint(min(log(...)))exponent calculation, which is several levels removed from the call site.naturalsize(float('inf'))andnaturalsize(float('-inf'))silently rendered as'inf QB'/'-inf QB', which is not a meaningful byte count for any real caller.Fix
Reject NaN, +inf, and -inf up front with a single
math.isfinite(bytes_)check that names the rejected value in the error message. The same check covers string inputs thatfloat()accepts but that don't represent a meaningful byte count ('inf','INF','NaN', etc.); non-numeric strings still reach the existingfloat()call and raise ValueError as before.Tests
Eight new cases in
tests/test_filesize.py:test_naturalsize_rejects_non_finite: parametrized overfloat('nan'),float('inf'),float('-inf').test_naturalsize_rejects_non_finite_strings: parametrized over'nan','inf','-inf','NaN','INF'.Both assert that
pytest.raises(ValueError, match='finite number of bytes')fires, so the fix is checked end-to-end on every relevant shape of non-finite input.Three new doctest cases in
naturalsize:naturalsize(0)(theabs < basepath was previously untested), and explicitTraceback/ValueErrorcases fornaturalsize(float('nan'))andnaturalsize(float('inf')).Full suite: 723 passed, 69 skipped (no regressions).