python module_error ai_generated true

AttributeError: module 'unittest' has no attribute 'mock'

ID: python/unittest-mock-no-attribute

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80%Fix Rate
90%Confidence
0Evidence
2024-01-22First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.9 active — — —
3.11 active — — —
3.12 active — — —

Root Cause

`unittest.mock` is a submodule that must be imported explicitly. Writing `import unittest` then `unittest.mock.patch(...)` fails because the submodule isn't loaded until imported.

generic

中文

`unittest.mock` 是子模块，必须显式导入。仅写 `import unittest` 后使用 `unittest.mock.patch(...)` 会失败，因为子模块未被加载。

Workarounds

  1. 98% success 
    Import the submodule explicitly:
from unittest import mock
# or
import unittest.mock

with mock.patch('mymodule.requests.get') as m:
    ...

Dead Ends

Common approaches that don't work:

  1. 80% fail

    mock has been a submodule since 3.3; version is not the problem, import style is.

  2. 65% fail

    Installing the backport doesn't bind `unittest.mock`; the attribute error persists.