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bpo-32117: Allow tuple unpacking in return and yield statements (gh-4509)

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Iterable unpacking is now allowed without parentheses in yield and return
statements, e.g. ``yield 1, 2, 3, *rest``. Thanks to David Cuthbert for the
change and jChapman for added tests.
This commit is contained in:
David Cuthbert 2018-09-21 18:31:15 -07:00 • committed by Guido van Rossum
parent 7279b5125e
commit fd97d1f1af
4 changed files with 18 additions and 6 deletions
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11
Lib/test/test_grammar.py
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@ -824,11 +824,17 @@ class GrammarTests(unittest.TestCase):
test_inner()
def test_return(self):
# 'return' [testlist]
# 'return' [testlist_star_expr]
def g1(): return
def g2(): return 1
def g3():
z = [2, 3]
return 1, *z
g1()
x = g2()
y = g3()
self.assertEqual(y, (1, 2, 3), "unparenthesized star expr return")
check_syntax_error(self, "class foo:return 1")
def test_break_in_finally(self):
@ -981,6 +987,9 @@ class GrammarTests(unittest.TestCase):
def g(): f((yield 1), 1)
def g(): f((yield from ()))
def g(): f((yield from ()), 1)
# Do not require parenthesis for tuple unpacking
def g(): rest = 4, 5, 6; yield 1, 2, 3, *rest
self.assertEquals(list(g()), [(1, 2, 3, 4, 5, 6)])
check_syntax_error(self, "def g(): f(yield 1)")
check_syntax_error(self, "def g(): f(yield 1, 1)")
check_syntax_error(self, "def g(): f(yield from ())")