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bpo-39176: Improve error message for 'named assignment' (GH-17777) (GH-17778) 

(cherry picked from commit 37143a8e3b)

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>
This commit is contained in:
Miss Islington (bot) 2019-12-31 19:28:08 -08:00 committed by Raymond Hettinger
parent 302b35f82b
commit 6c004955ac
3 changed files with 4 additions and 4 deletions
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4
Lib/test/test_named_expressions.py
View File

@ -32,7 +32,7 @@ class NamedExpressionInvalidTest(unittest.TestCase):
def test_named_expression_invalid_06(self): def test_named_expression_invalid_06(self):
code = """((a, b) := (1, 2))""" code = """((a, b) := (1, 2))"""
with self.assertRaisesRegex(SyntaxError, "cannot use named assignment with tuple"): with self.assertRaisesRegex(SyntaxError, "cannot use assignment expressions with tuple"):
exec(code, {}, {}) exec(code, {}, {})
def test_named_expression_invalid_07(self): def test_named_expression_invalid_07(self):
@ -90,7 +90,7 @@ class NamedExpressionInvalidTest(unittest.TestCase):
code = """(lambda: x := 1)""" code = """(lambda: x := 1)"""
with self.assertRaisesRegex(SyntaxError, with self.assertRaisesRegex(SyntaxError,
"cannot use named assignment with lambda"): "cannot use assignment expressions with lambda"):
exec(code, {}, {}) exec(code, {}, {})
def test_named_expression_invalid_16(self): def test_named_expression_invalid_16(self):

2
Lib/test/test_syntax.py
View File

@ -45,7 +45,7 @@ SyntaxError: cannot assign to True
>>> (True := 1) >>> (True := 1)
Traceback (most recent call last): Traceback (most recent call last):
SyntaxError: cannot use named assignment with True SyntaxError: cannot use assignment expressions with True
>>> obj.__debug__ = 1 >>> obj.__debug__ = 1
Traceback (most recent call last): Traceback (most recent call last):

2
Python/ast.c
View File

@ -1955,7 +1955,7 @@ ast_for_namedexpr(struct compiling *c, const node *n)
if (target->kind != Name_kind) { if (target->kind != Name_kind) {
const char *expr_name = get_expr_name(target); const char *expr_name = get_expr_name(target);
if (expr_name != NULL) { if (expr_name != NULL) {
ast_error(c, n, "cannot use named assignment with %s", expr_name); ast_error(c, n, "cannot use assignment expressions with %s", expr_name);
} }
return NULL; return NULL;
} }