python type_error ai_generated true

TypeError: 'MagicMock' object is not callable

ID: python/unittest-mock-magicmock-not-callable

Also available as: JSON · Markdown · 中文
80%Fix Rate
87%Confidence
0Evidence
2024-07-12First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

A MagicMock instance was used where a callable is expected, but the mock was not configured to be callable, or the mock's return_value was accessed incorrectly.

generic

中文

在需要可调用对象的地方使用了 MagicMock 实例，但该 mock 未配置为可调用，或者错误地访问了 mock 的 return_value。

Workarounds

  1. 95% success 
    mock_func = MagicMock()
mock_func.return_value = 42
assert mock_func() == 42
  2. 92% success 
    mock_func = MagicMock()
mock_func.side_effect = lambda x: x * 2
assert mock_func(5) == 10

Dead Ends

Common approaches that don't work:

  1. 85% fail

    Mock is also not callable by default. The issue is configuration, not the mock class.

  2. 90% fail

    If the mock is not callable, adding parentheses will still raise TypeError. The mock must be configured as callable.