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Add ast.Constant

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Issue #26146: Add a new kind of AST node: ast.Constant. It can be used by
external AST optimizers, but the compiler does not emit directly such node.

An optimizer can replace the following AST nodes with ast.Constant:

* ast.NameConstant: None, False, True
* ast.Num: int, float, complex
* ast.Str: str
* ast.Bytes: bytes
* ast.Tuple if items are constants too: tuple
* frozenset

Update code to accept ast.Constant instead of ast.Num and/or ast.Str:

* compiler
* docstrings
* ast.literal_eval()
* Tools/parser/unparse.py
This commit is contained in:
Victor Stinner 2016-01-26 00:40:57 +01:00
parent 0dceb91866
commit f2c1aa1661
14 changed files with 401 additions and 44 deletions
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5
Python/future.c
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@ -79,7 +79,10 @@ future_parse(PyFutureFeatures *ff, mod_ty mod, PyObject *filename)
i = 0;
first = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
if (first->kind == Expr_kind && first->v.Expr.value->kind == Str_kind)
if (first->kind == Expr_kind
&& (first->v.Expr.value->kind == Str_kind
|| (first->v.Expr.value->kind == Constant_kind
&& PyUnicode_CheckExact(first->v.Expr.value->v.Constant.value))))
i++;