python module_error ai_generated true

ImportError: No module named 'module_to_patch'

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

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80%Fix Rate
85%Confidence
0Evidence
2025-07-25First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —
3.10 active — — —
3.11 active — — —
3.12 active — — —

Root Cause

The `@unittest.mock.patch('module_to_patch.ClassName')` decorator tries to patch a module that does not exist or is not importable.

generic

中文

`@unittest.mock.patch('module_to_patch.ClassName')` 装饰器尝试修补一个不存在或不可导入的模块。

Workarounds

  1. 95% success 
    Ensure the module path is correct: `@patch('my_package.module_to_patch.ClassName')`
  2. 90% success 
    Use patch.object() with the actual class: `@patch.object(MyClass, 'method_name')`

Dead Ends

Common approaches that don't work:

  1. 60% fail

    The module might be an internal part of the codebase that should be patched differently.

  2. 90% fail

    Decorators are evaluated at import time; try-except cannot catch import errors in this context.