python runtime_error ai_generated true

断言错误：断言 5 == 3，'期望 5 但得到 3'

AssertionError: assert 5 == 3, 'Expected 5 but got 3'

ID: python/pytest-assertion-with-message-missing

其他格式: JSON · Markdown 中文 · English
80%修复率
85%置信度
0证据数
2024-03-15首次发现

版本兼容性

版本状态引入弃用备注
3.x active — — —

根因分析

断言失败，但自定义消息未显示，因为使用带有元组的普通 assert 时，pytest 不会显示消息。

English

The assertion failed and the custom message is not being displayed because pytest doesn't show the message when using plain assert with a tuple.

generic

解决方案

  1. 95% 成功率 
    with pytest.raises(AssertionError, match='Expected 5 but got 3'):
    assert 5 == 3
  2. 99% 成功率 
    assert 5 == 3, 'Expected 5 but got 3'

无效尝试

常见但无效的做法:

  1. 90% 失败

    Parentheses create a tuple, which pytest interprets as a comparison, not a message.

  2. 85% 失败

    The issue is not the f-string but the tuple; f-string still becomes a tuple element.