python data_error ai_generated true

AssertionError: assert {'a': 1, 'b': 2, ...} == {'a': 1, 'b': 3, ...} 省略了 15 个相同项，使用 -vv 显示 不同项: {'b': 2} != {'b': 3}

AssertionError: assert {'a': 1, 'b': 2, ...} == {'a': 1, 'b': 3, ...} Omitting 15 identical items, use -vv to show Differing items: {'b': 2} != {'b': 3}

ID: python/pytest-assertion-dict-diff-truncated

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80%修复率
82%置信度
0证据数
2024-10-19首次发现

版本兼容性

版本状态引入弃用备注
7.x active — — —
8.x active — — —

根因分析

pytest 默认截断大型字典/列表差异；实际分歧隐藏在省略项中，使 CI 日志中的失败难以诊断。

English

pytest truncates large dict/list diffs by default; the actual divergence is hidden among omitted items, making the failure hard to diagnose in CI logs.

generic

解决方案

  1. 90% 成功率 
    Raise verbosity:
pytest -vv tests/test_config.py::test_merge
# or set in config
# [tool.pytest.ini_options]
# addopts = "-vv"
  2. 85% 成功率 
    Or compute a minimal diff explicitly:
from deepdiff import DeepDiff
diff = DeepDiff(expected, actual, ignore_order=True)
assert not diff, diff

无效尝试

常见但无效的做法:

  1. 65% 失败

    Output is captured and interleaved unpredictably; hard to diff visually in CI.

  2. 50% 失败

    Works but noisy and slow; you lose pytest's structured diff.