[issue40126] Incorrect error handling in unittest.mock

[Barry McLarnon]

Barry McLarnon <bmclarnon at hotmail.co.uk> added the comment:

After further investigation, it seems this was fixed in https://github.com/python/cpython/commit/436c2b0d67da68465e709a96daac7340af3a5238

However, this fix was as part of an unrelated changeset and in a different function in 3.8+, and was never rolled back to 3.7 and below. PR opened to add the missing attribute instantiation to 3.7.

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nosy:  -python-dev
versions:  -Python 3.8, Python 3.9

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