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bpo-35814: Allow unpacking in r.h.s of annotated assignment expressions (GH-13760)

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Pablo Galindo 2019-06-03 08:34:20 +01:00 committed by GitHub
parent d9677f36fe
commit 8565f6b6db
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5 changed files with 9 additions and 3 deletions
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2
Grammar/Grammar
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@ -84,7 +84,7 @@ small_stmt: (expr_stmt | del_stmt | pass_stmt | flow_stmt |
import_stmt | global_stmt | nonlocal_stmt | assert_stmt) import_stmt | global_stmt | nonlocal_stmt | assert_stmt)
expr_stmt: testlist_star_expr (annassign | augassign (yield_expr|testlist) | expr_stmt: testlist_star_expr (annassign | augassign (yield_expr|testlist) |
[('=' (yield_expr|testlist_star_expr))+ [TYPE_COMMENT]] ) [('=' (yield_expr|testlist_star_expr))+ [TYPE_COMMENT]] )
annassign: ':' test ['=' (yield_expr|testlist)] annassign: ':' test ['=' (yield_expr|testlist_star_expr)]
testlist_star_expr: (test|star_expr) (',' (test|star_expr))* [','] testlist_star_expr: (test|star_expr) (',' (test|star_expr))* [',']
augassign: ('+=' | '-=' | '*=' | '@=' | '/=' | '%=' | '&=' | '|=' | '^=' | augassign: ('+=' | '-=' | '*=' | '@=' | '/=' | '%=' | '&=' | '|=' | '^=' |
'<<=' | '>>=' | '**=' | '//=') '<<=' | '>>=' | '**=' | '//=')

4
Lib/test/test_grammar.py
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@ -454,6 +454,10 @@ class GrammarTests(unittest.TestCase):
exec(stmt, ns) exec(stmt, ns)
self.assertEqual(list(ns['f']()), [None]) self.assertEqual(list(ns['f']()), [None])
ns = {"a": 1, 'b': (2, 3, 4), "c":5, "Tuple": typing.Tuple}
exec('x: Tuple[int, ...] = a,*b,c', ns)
self.assertEqual(ns['x'], (1, 2, 3, 4, 5))
def test_funcdef(self): def test_funcdef(self):
### [decorators] 'def' NAME parameters ['->' test] ':' suite ### [decorators] 'def' NAME parameters ['->' test] ':' suite
### decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE ### decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE

2
Misc/NEWS.d/next/Core and Builtins/2019-06-03-00-51-02.bpo-35814.Cf7sGY.rst Normal file
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@ -0,0 +1,2 @@
Allow unpacking in the right hand side of annotated assignments. In
particular, ``t: Tuple[int, ...] = x, y, *z`` is now allowed.

2
Python/ast.c
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@ -3398,7 +3398,7 @@ ast_for_expr_stmt(struct compiling *c, const node *n)
} }
else { else {
ch = CHILD(ann, 3); ch = CHILD(ann, 3);
if (TYPE(ch) == testlist) { if (TYPE(ch) == testlist_star_expr) {
expr3 = ast_for_testlist(c, ch); expr3 = ast_for_testlist(c, ch);
} }
else { else {

2
Python/graminit.c
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@ -742,7 +742,7 @@ static const arc arcs_17_2[2] = {
{0, 2}, {0, 2},
}; };
static const arc arcs_17_3[2] = { static const arc arcs_17_3[2] = {
{47, 4}, {81, 4},
{84, 4}, {84, 4},
}; };
static const arc arcs_17_4[1] = { static const arc arcs_17_4[1] = {