python config_error ai_generated true

AttributeError: <class 'module'> does not have the attribute 'some_function'

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

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80%Fix Rate
88%Confidence
0Evidence
2025-03-08First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.9 active — — —

Root Cause

Using @patch or patch.object with an incorrect target path (e.g., patching a non-existent attribute) causes an AttributeError when the mock is applied.

generic

中文

使用 @patch 或 patch.object 时，目标路径不正确（例如，修补不存在的属性）会在应用模拟时导致 AttributeError。

Workarounds

  1. 90% success 
    Verify the exact attribute path: e.g., patch('mymodule.submodule.some_function') and ensure the attribute exists in the module.
  2. 85% success 
    Use patch.object with the actual object: patch.object(mymodule, 'some_function') after importing the module.

Dead Ends

Common approaches that don't work:

  1. 50% fail

    Changing the patch target to a different module without verifying the attribute exists may still fail if the attribute is imported incorrectly.

  2. 60% fail

    Using patch.object with a class that has the attribute but misspelling the attribute name leads to a similar error.