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gh-92986: Fix ast.unparse when ImportFrom.level is None (#92992)

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This doesn't happen naturally, but is allowed by the ASDL and compiler.
We don't want to change ASDL for backward compatibility reasons
(#57645, #92987)
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Shantanu 2022-09-05 10:14:50 -07:00 committed by GitHub
parent 2c7d2e8d46
commit 200c9a8da0
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3 changed files with 8 additions and 1 deletions
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2
Lib/ast.py
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@ -853,7 +853,7 @@ class _Unparser(NodeVisitor):
def visit_ImportFrom(self, node):
self.fill("from ")
self.write("." * node.level)
self.write("." * (node.level or 0))
if node.module:
self.write(node.module)
self.write(" import ")

6
Lib/test/test_unparse.py
View File

@ -422,6 +422,12 @@ class UnparseTestCase(ASTTestCase):
def test_invalid_yield_from(self):
self.check_invalid(ast.YieldFrom(value=None))
def test_import_from_level_none(self):
tree = ast.ImportFrom(module='mod', names=[ast.alias(name='x')])
self.assertEqual(ast.unparse(tree), "from mod import x")
tree = ast.ImportFrom(module='mod', names=[ast.alias(name='x')], level=None)
self.assertEqual(ast.unparse(tree), "from mod import x")
def test_docstrings(self):
docstrings = (
'this ends with double quote"',

1
Misc/NEWS.d/next/Library/2022-05-19-22-34-42.gh-issue-92986.e6uKxj.rst Normal file
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@ -0,0 +1 @@
Fix :func:`ast.unparse` when ``ImportFrom.level`` is None