mirror of https://github.com/python/cpython
bpo-43521: Allow ast.unparse with empty sets and NaN (GH-24897)
Automerge-Triggered-By: GH:pablogsal
This commit is contained in:
parent
eec8e61992
commit
08ff4369af
20
Lib/ast.py
20
Lib/ast.py
|
@ -1199,8 +1199,13 @@ class _Unparser(NodeVisitor):
|
|||
|
||||
def _write_constant(self, value):
|
||||
if isinstance(value, (float, complex)):
|
||||
# Substitute overflowing decimal literal for AST infinities.
|
||||
self.write(repr(value).replace("inf", _INFSTR))
|
||||
# Substitute overflowing decimal literal for AST infinities,
|
||||
# and inf - inf for NaNs.
|
||||
self.write(
|
||||
repr(value)
|
||||
.replace("inf", _INFSTR)
|
||||
.replace("nan", f"({_INFSTR}-{_INFSTR})")
|
||||
)
|
||||
elif self._avoid_backslashes and isinstance(value, str):
|
||||
self._write_str_avoiding_backslashes(value)
|
||||
else:
|
||||
|
@ -1273,10 +1278,13 @@ class _Unparser(NodeVisitor):
|
|||
self.traverse(node.orelse)
|
||||
|
||||
def visit_Set(self, node):
|
||||
if not node.elts:
|
||||
raise ValueError("Set node should have at least one item")
|
||||
with self.delimit("{", "}"):
|
||||
self.interleave(lambda: self.write(", "), self.traverse, node.elts)
|
||||
if node.elts:
|
||||
with self.delimit("{", "}"):
|
||||
self.interleave(lambda: self.write(", "), self.traverse, node.elts)
|
||||
else:
|
||||
# `{}` would be interpreted as a dictionary literal, and
|
||||
# `set` might be shadowed. Thus:
|
||||
self.write('{*()}')
|
||||
|
||||
def visit_Dict(self, node):
|
||||
def write_key_value_pair(k, v):
|
||||
|
|
|
@ -199,6 +199,12 @@ class UnparseTestCase(ASTTestCase):
|
|||
self.check_ast_roundtrip("1e1000j")
|
||||
self.check_ast_roundtrip("-1e1000j")
|
||||
|
||||
def test_nan(self):
|
||||
self.assertASTEqual(
|
||||
ast.parse(ast.unparse(ast.Constant(value=float('nan')))),
|
||||
ast.parse('1e1000 - 1e1000')
|
||||
)
|
||||
|
||||
def test_min_int(self):
|
||||
self.check_ast_roundtrip(str(-(2 ** 31)))
|
||||
self.check_ast_roundtrip(str(-(2 ** 63)))
|
||||
|
@ -252,6 +258,12 @@ class UnparseTestCase(ASTTestCase):
|
|||
def test_set_literal(self):
|
||||
self.check_ast_roundtrip("{'a', 'b', 'c'}")
|
||||
|
||||
def test_empty_set(self):
|
||||
self.assertASTEqual(
|
||||
ast.parse(ast.unparse(ast.Set(elts=[]))),
|
||||
ast.parse('{*()}')
|
||||
)
|
||||
|
||||
def test_set_comprehension(self):
|
||||
self.check_ast_roundtrip("{x for x in range(5)}")
|
||||
|
||||
|
@ -326,9 +338,6 @@ class UnparseTestCase(ASTTestCase):
|
|||
def test_invalid_fstring_backslash(self):
|
||||
self.check_invalid(ast.FormattedValue(value=ast.Constant(value="\\\\")))
|
||||
|
||||
def test_invalid_set(self):
|
||||
self.check_invalid(ast.Set(elts=[]))
|
||||
|
||||
def test_invalid_yield_from(self):
|
||||
self.check_invalid(ast.YieldFrom(value=None))
|
||||
|
||||
|
|
|
@ -0,0 +1 @@
|
|||
``ast.unparse`` can now render NaNs and empty sets.
|
Loading…
Reference in New Issue