Fix decimal.FloatOperation error in pytest.approx Decimal __repr__#13542
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coder-aditi wants to merge 4 commits intopytest-dev:mainfrom
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Fix decimal.FloatOperation error in pytest.approx Decimal __repr__#13542coder-aditi wants to merge 4 commits intopytest-dev:mainfrom
coder-aditi wants to merge 4 commits intopytest-dev:mainfrom
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RonnyPfannschmidt
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Jun 18, 2025
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RonnyPfannschmidt
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RonnyPfannschmidt
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thanks for getting this started - this looks like a good start
i want to get some verification from people more familiar with Decimals and their behaviours
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| def test_decimal_approx_repr_issue(): | ||
| trap = decimal.getcontext().traps[decimal.FloatOperation] |
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use momkeypatch.setitem to ensure undo happens even on failures (not that i expect a failure)
| DEFAULT_RELATIVE_TOLERANCE = Decimal("1e-6") | ||
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| def __repr__(self): | ||
| rel = Decimal(str(self.rel)) if isinstance(self.rel, float) else self.rel |
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we need to verify if using Decimal.from_float is more correct here
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also we might need to generally ensure that rel is not a float
nicoddemus
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Jun 18, 2025
| DEFAULT_ABSOLUTE_TOLERANCE = Decimal("1e-12") | ||
| DEFAULT_RELATIVE_TOLERANCE = Decimal("1e-6") | ||
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| def __repr__(self): |
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Suggested change
| def __repr__(self): | |
| def __repr__(self) -> str: |
Co-authored-by: Bruno Oliveira <bruno@soliv.dev>
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Superseded by #13543. |
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Fix #13530
Summary
This PR addresses a decimal.FloatOperation error that happens when calling repr() on a pytest.approx object created with a decimal.Decimal value. The error arises from comparing and formatting Decimal and float values without proper conversion, which activates the FloatOperation trap.
Changes
I modified the repr method to carefully handle Decimal and float attributes. This is done by explicitly converting float values to Decimal before comparisons and formatting.
I added checks for None to prevent invalid comparisons.
I avoided direct comparisons between float and Decimal that can lead to FloatOperation exceptions.
Testing
I created a minimal test to reproduce the FloatOperation error from pytest.approx(Decimal)'s repr().
The test passes after applying this fix, confirming that the issue is resolved.