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bpo-42316: Allow unparenthesized walrus operator in indexes (GH-23317)

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Lysandros Nikolaou 2020-11-17 01:09:35 +02:00 • committed by GitHub
parent cb3e5ed071
commit cae60187cf
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4 changed files with 29 additions and 7 deletions
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21
Lib/test/test_named_expressions.py
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@ -271,6 +271,27 @@ class NamedExpressionAssignmentTest(unittest.TestCase):
fib = {(c := a): (a := b) + (b := a + c) - b for __ in range(6)}
self.assertEqual(fib, {1: 2, 2: 3, 3: 5, 5: 8, 8: 13, 13: 21})
def test_named_expression_assignment_17(self):
a = [1]
element = a[b:=0]
self.assertEqual(b, 0)
self.assertEqual(element, a[0])
def test_named_expression_assignment_18(self):
class TwoDimensionalList:
def __init__(self, two_dimensional_list):
self.two_dimensional_list = two_dimensional_list
def __getitem__(self, index):
return self.two_dimensional_list[index[0]][index[1]]
a = TwoDimensionalList([[1], [2]])
element = a[b:=0, c:=0]
self.assertEqual(b, 0)
self.assertEqual(c, 0)
self.assertEqual(element, a.two_dimensional_list[b][c])
class NamedExpressionScopeTest(unittest.TestCase):