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PEP 695 changed how class decorators are traced #104686

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type-bugAn unexpected behavior, bug, or error
@nedbat

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@nedbat

Commit24d8b88 ("gh-103763: Implement PEP 695 (#103764)") changed how nested class decorators are traced.

Example file nightly-20230518.py:

defdecorator(arg):def_dec(c):returncreturn_dec@decorator(6)@decorator(len([8]),)classMyObject(object):X=13a=14

Tracing with 3.12.0a7:

% python3.12 -m trace --trace nightly-20230518.py --- modulename: nightly-20230518, funcname: <module>nightly-20230518.py(1): def decorator(arg):nightly-20230518.py(6): @decorator(6) --- modulename: nightly-20230518, funcname: decoratornightly-20230518.py(2):     def _dec(c):nightly-20230518.py(4):     return _decnightly-20230518.py(7): @decorator(nightly-20230518.py(8):     len([8]),nightly-20230518.py(7): @decorator( --- modulename: nightly-20230518, funcname: decoratornightly-20230518.py(2):     def _dec(c):nightly-20230518.py(4):     return _decnightly-20230518.py(10): class MyObject(            <*****nightly-20230518.py(11):     objectnightly-20230518.py(10): class MyObject( --- modulename: nightly-20230518, funcname: MyObjectnightly-20230518.py(6): @decorator(6)nightly-20230518.py(13):     X = 13nightly-20230518.py(7): @decorator( --- modulename: nightly-20230518, funcname: _decnightly-20230518.py(3):         return cnightly-20230518.py(6): @decorator(6) --- modulename: nightly-20230518, funcname: _decnightly-20230518.py(3):         return cnightly-20230518.py(10): class MyObject(nightly-20230518.py(14): a = 14
% python3.12 -c "import sys; print(sys.version)"3.12.0a7 (main, Apr  5 2023, 05:51:58) [Clang 14.0.3 (clang-1403.0.22.14.1)]

Running with newer code:

% /usr/local/cpython/bin/python3 -m trace --trace nightly-20230518.py --- modulename: nightly-20230518, funcname: <module>nightly-20230518.py(1): def decorator(arg):nightly-20230518.py(6): @decorator(6) --- modulename: nightly-20230518, funcname: decoratornightly-20230518.py(2):     def _dec(c):nightly-20230518.py(4):     return _decnightly-20230518.py(7): @decorator(nightly-20230518.py(8):     len([8]),nightly-20230518.py(7): @decorator( --- modulename: nightly-20230518, funcname: decoratornightly-20230518.py(2):     def _dec(c):nightly-20230518.py(4):     return _decnightly-20230518.py(6): @decorator(6)               <*****nightly-20230518.py(11):     objectnightly-20230518.py(10): class MyObject( --- modulename: nightly-20230518, funcname: MyObjectnightly-20230518.py(6): @decorator(6)nightly-20230518.py(13):     X = 13nightly-20230518.py(7): @decorator( --- modulename: nightly-20230518, funcname: _decnightly-20230518.py(3):         return cnightly-20230518.py(6): @decorator(6) --- modulename: nightly-20230518, funcname: _decnightly-20230518.py(3):         return cnightly-20230518.py(10): class MyObject(nightly-20230518.py(14): a = 14
% /usr/local/cpython/bin/python3 -c "import sys; print(sys.version)"3.12.0a7+ (tags/v3.12.0a7-548-g24d8b88420:24d8b88420, May 20 2023, 06:39:38) [Clang 14.0.3 (clang-1403.0.22.14.1)]

The different lines are marked with<*****.

cc:@JelleZijlstra@markshannon

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