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bpo-43224: Implement PEP 646 grammar changes (GH-31018)

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Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
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Matthew Rahtz 2022-03-26 16:55:35 +00:00 • committed by GitHub
parent 26cca8067b
commit e8e737bcf6
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12 changed files with 4324 additions and 3396 deletions
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26
Lib/test/test_unparse.py
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@ -344,7 +344,17 @@ class UnparseTestCase(ASTTestCase):
self.check_ast_roundtrip("a[i]")
self.check_ast_roundtrip("a[i,]")
self.check_ast_roundtrip("a[i, j]")
# The AST for these next two both look like `a[(*a,)]`
self.check_ast_roundtrip("a[(*a,)]")
self.check_ast_roundtrip("a[*a]")
self.check_ast_roundtrip("a[b, *a]")
self.check_ast_roundtrip("a[*a, c]")
self.check_ast_roundtrip("a[b, *a, c]")
self.check_ast_roundtrip("a[*a, *a]")
self.check_ast_roundtrip("a[b, *a, *a]")
self.check_ast_roundtrip("a[*a, b, *a]")
self.check_ast_roundtrip("a[*a, *a, b]")
self.check_ast_roundtrip("a[b, *a, *a, c]")
self.check_ast_roundtrip("a[(a:=b)]")
self.check_ast_roundtrip("a[(a:=b,c)]")
self.check_ast_roundtrip("a[()]")
@ -543,9 +553,23 @@ class CosmeticTestCase(ASTTestCase):
self.check_src_roundtrip(f"{prefix} 1")
def test_slices(self):
self.check_src_roundtrip("a[()]")
self.check_src_roundtrip("a[1]")
self.check_src_roundtrip("a[1, 2]")
self.check_src_roundtrip("a[(1, *a)]")
# Note that `a[*a]`, `a[*a,]`, and `a[(*a,)]` all evaluate to the same
# thing at runtime and have the same AST, but only `a[*a,]` passes
# this test, because that's what `ast.unparse` produces.
self.check_src_roundtrip("a[*a,]")
self.check_src_roundtrip("a[1, *a]")
self.check_src_roundtrip("a[*a, 2]")
self.check_src_roundtrip("a[1, *a, 2]")
self.check_src_roundtrip("a[*a, *a]")
self.check_src_roundtrip("a[1, *a, *a]")
self.check_src_roundtrip("a[*a, 1, *a]")
self.check_src_roundtrip("a[*a, *a, 1]")
self.check_src_roundtrip("a[1, *a, *a, 2]")
self.check_src_roundtrip("a[1:2, *a]")
self.check_src_roundtrip("a[*a, 1:2]")
def test_lambda_parameters(self):
self.check_src_roundtrip("lambda: something")