python type_error ai_generated true

属性错误：使用 autospec 时，模拟对象没有属性 'non_existent_method'

AttributeError: Mock object has no attribute 'non_existent_method' when using autospec

ID: python/unittest-mock-autospec-attribute-error

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80%修复率
84%置信度
0证据数
2026-07-15首次发现

版本兼容性

版本状态引入弃用备注
3.9 active — — —

根因分析

在 patch 或 create_autospec 中使用 autospec=True 会将模拟限制为仅具有原始对象上存在的属性，访问不存在的属性会引发 AttributeError。

English

Using autospec=True in patch or create_autospec restricts the mock to only have attributes that exist on the original object, and accessing a non-existent attribute raises an AttributeError.

generic

解决方案

  1. 85% 成功率 
    Ensure the attribute exists on the original object, or use autospec with a spec object that includes the attribute: create_autospec(MyClass, instance=True)
  2. 75% 成功率 
    Use spec_set instead of autospec to allow additional attributes while still checking existing ones.

无效尝试

常见但无效的做法:

  1. 50% 失败

    Disabling autospec (autospec=False) may allow the test to pass but hides potential mismatches between the mock and the real API.

  2. 40% 失败

    Adding the missing attribute to the original object may not be feasible if it's a third-party library.