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Title: bpo-43002: Fix description of behaviour of an exception class in 'from' clause by mdickinson · Pull Request #24303 · python/cpython · GitHub

Open Graph Title: bpo-43002: Fix description of behaviour of an exception class in 'from' clause by mdickinson · Pull Request #24303 · python/cpython

X Title: bpo-43002: Fix description of behaviour of an exception class in 'from' clause by mdickinson · Pull Request #24303 · python/cpython

Description: In a raise from statement, is permitted to be an exception instance, an exception class, or None. The reference manual suggests that in the first two cases, the value of is attached directly to the raise exception as the __cause__. But in the implementation, an exception class is first instantiated before being attached to the raised exception: cpython/Python/ceval.c Lines 4758 to 4763 in b745a61 if (PyExceptionClass_Check(cause)) { fixed_cause = _PyObject_CallNoArg(cause); if (fixed_cause == NULL) goto raise_error; Py_DECREF(cause); } This PR fixes the documentation to match the implementation. https://bugs.python.org/issue43002

Open Graph Description: In a raise <expr> from <expr2> statement, <expr2> is permitted to be an exception instance, an exception class, or None. The reference manual suggests that in the first two cases,...

X Description: In a raise &lt;expr&gt; from &lt;expr2&gt; statement, &lt;expr2&gt; is permitted to be an exception instance, an exception class, or None. The reference manual suggests that...

Opengraph URL: https://github.com/python/cpython/pull/24303

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