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bpo-44142: drop redundant parantheses when unparsing tuples as assignment targets (GH-26156)

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Batuhan Taskaya 2021-05-16 16:33:22 +03:00 • committed by GitHub
parent 1a08c5ac49
commit 51cef8be8c
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4 changed files with 47 additions and 4 deletions
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37
Lib/test/test_unparse.py
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@ -541,6 +541,43 @@ class CosmeticTestCase(ASTTestCase):
self.check_src_roundtrip("lambda x, y, /, z, q, *, u: None")
self.check_src_roundtrip("lambda x, *y, **z: None")
def test_star_expr_assign_target(self):
for source_type, source in [
("single assignment", "{target} = foo"),
("multiple assignment", "{target} = {target} = bar"),
("for loop", "for {target} in foo:\n pass"),
("async for loop", "async for {target} in foo:\n pass")
]:
for target in [
"a",
"a,",
"a, b",
"a, *b, c",
"a, (b, c), d",
"a, (b, c, d), *e",
"a, (b, *c, d), e",
"a, (b, *c, (d, e), f), g",
"[a]",
"[a, b]",
"[a, *b, c]",
"[a, [b, c], d]",
"[a, [b, c, d], *e]",
"[a, [b, *c, d], e]",
"[a, [b, *c, [d, e], f], g]",
"a, [b, c], d",
"[a, b, (c, d), (e, f)]",
"a, b, [*c], d, e"
]:
with self.subTest(source_type=source_type, target=target):
self.check_src_roundtrip(source.format(target=target))
def test_star_expr_assign_target_multiple(self):
self.check_src_roundtrip("a = b = c = d")
self.check_src_roundtrip("a, b = c, d = e, f = g")
self.check_src_roundtrip("[a, b] = [c, d] = [e, f] = g")
self.check_src_roundtrip("a, b = [c, d] = e, f = g")
class DirectoryTestCase(ASTTestCase):
"""Test roundtrip behaviour on all files in Lib and Lib/test."""