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bpo-38870: Don't put unnecessary parentheses on class declarations in ast.parse (GH-20134)

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Batuhan Taskaya 2020-05-17 00:53:25 +03:00 committed by GitHub
parent ce4a753dcb
commit 25160cdc47
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2 changed files with 15 additions and 2 deletions
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2
Lib/ast.py
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@ -930,7 +930,7 @@ class _Unparser(NodeVisitor):
self.fill("@")
self.traverse(deco)
self.fill("class " + node.name)
with self.delimit("(", ")"):
with self.delimit_if("(", ")", condition = node.bases or node.keywords):
comma = False
for e in node.bases:
if comma:

15
Lib/test/test_unparse.py
View File

@ -110,7 +110,7 @@ with f() as x, g() as y:
docstring_prefixes = [
"",
"class foo():\n ",
"class foo:\n ",
"def foo():\n ",
"async def foo():\n ",
]
@ -367,6 +367,19 @@ class CosmeticTestCase(ASTTestCase):
self.check_src_roundtrip("call((yield x))")
self.check_src_roundtrip("return x + (yield x)")
def test_class_bases_and_keywords(self):
self.check_src_roundtrip("class X:\n pass")
self.check_src_roundtrip("class X(A):\n pass")
self.check_src_roundtrip("class X(A, B, C, D):\n pass")
self.check_src_roundtrip("class X(x=y):\n pass")
self.check_src_roundtrip("class X(metaclass=z):\n pass")
self.check_src_roundtrip("class X(x=y, z=d):\n pass")
self.check_src_roundtrip("class X(A, x=y):\n pass")
self.check_src_roundtrip("class X(A, **kw):\n pass")
self.check_src_roundtrip("class X(*args):\n pass")
self.check_src_roundtrip("class X(*args, **kwargs):\n pass")
def test_docstrings(self):
docstrings = (
'"""simple doc string"""',