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bpo-35877: Make parenthesis optional for named expression in while statement (GH-11724)

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* Add parenthesis optional in named expressions for while statement

* Add NEWS entry
This commit is contained in:
Xtreak 2019-02-02 03:10:16 +05:30 • committed by Emily Morehouse
parent 85d83ec7c9
commit d4fceaafb8
4 changed files with 5 additions and 2 deletions
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2
Grammar/Grammar
View file

@ -72,7 +72,7 @@ assert_stmt: 'assert' test [',' test]
compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | with_stmt | funcdef | classdef | decorated | async_stmt compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | with_stmt | funcdef | classdef | decorated | async_stmt
async_stmt: 'async' (funcdef | with_stmt | for_stmt) async_stmt: 'async' (funcdef | with_stmt | for_stmt)
if_stmt: 'if' namedexpr_test ':' suite ('elif' namedexpr_test ':' suite)* ['else' ':' suite] if_stmt: 'if' namedexpr_test ':' suite ('elif' namedexpr_test ':' suite)* ['else' ':' suite]
while_stmt: 'while' test ':' suite ['else' ':' suite] while_stmt: 'while' namedexpr_test ':' suite ['else' ':' suite]
for_stmt: 'for' exprlist 'in' testlist ':' [TYPE_COMMENT] suite ['else' ':' suite] for_stmt: 'for' exprlist 'in' testlist ':' [TYPE_COMMENT] suite ['else' ':' suite]
try_stmt: ('try' ':' suite try_stmt: ('try' ':' suite
((except_clause ':' suite)+ ((except_clause ':' suite)+

1
Lib/test/test_parser.py
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@ -426,6 +426,7 @@ def test_named_expressions(self):
self.check_suite("(a := 1)") self.check_suite("(a := 1)")
self.check_suite("(a := a)") self.check_suite("(a := a)")
self.check_suite("if (match := pattern.search(data)) is None: pass") self.check_suite("if (match := pattern.search(data)) is None: pass")
self.check_suite("while match := pattern.search(f.read()): pass")
self.check_suite("[y := f(x), y**2, y**3]") self.check_suite("[y := f(x), y**2, y**3]")
self.check_suite("filtered_data = [y for x in data if (y := f(x)) is None]") self.check_suite("filtered_data = [y for x in data if (y := f(x)) is None]")
self.check_suite("(y := f(x))") self.check_suite("(y := f(x))")

2
Misc/NEWS.d/next/Core and Builtins/2019-02-01-22-38-11.bpo-35877.Jrse8f.rst Normal file
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@ -0,0 +1,2 @@
Make parenthesis optional for named expressions in while statement. Patch by
Karthikeyan Singaravelan.

2
Python/graminit.c
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@ -971,7 +971,7 @@ static arc arcs_42_0[1] = {
{103, 1}, {103, 1},
}; };
static arc arcs_42_1[1] = { static arc arcs_42_1[1] = {
{26, 2}, {99, 2},
}; };
static arc arcs_42_2[1] = { static arc arcs_42_2[1] = {
{27, 3}, {27, 3},