New submission from STINNER Victor: The _ast.AST constructor requires a tuple with the same number of items than the fields list.
Example with Raise: ASDL: Raise(expr? exc, expr? cause) >>> import _ast >>> _ast.Raise() <_ast.Raise object at 0x7fc2ca7dee90> >>> _ast.Raise(1) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: Raise constructor takes either 0 or 2 positional arguments >>> _ast.Raise(1, 2) <_ast.Raise object at 0x7fc2ca7def60> The cause field is optional in the ASDL, but required in the _ast module. A tradeoff would be to add the minimum and maximum number of fields to _ast.AST. This issue should prevent API breakage caused by the new docstring attribute added by issue #29463. ---------- messages: 288372 nosy: haypo, inada.naoki priority: normal severity: normal status: open title: ast module doesn't support optional fields of Parser/Python.asdl type: enhancement versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue29622> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
