[PR #13543/111685cc backport][8.4.x] Fix decimal.FloatOperation error in pytest.approx Decimal __repr__ #13555
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nicoddemus
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Jun 22, 2025
nicoddemus
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This is a backport of PR #13543 as merged into main (111685c).
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.