8000 gh-118761: Fix star-import of ast (alternative) by JelleZijlstra · Pull Request #132025 · python/cpython · GitHub
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gh-118761: Fix star-import of ast (alternative) #132025

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Merged
merged 2 commits into from
Apr 2, 2025
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gh-118761: Fix star-import of ast (alternative) #132025

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gh-118761: Fix star-import of ast (alternative)
JelleZijlstra Apr 2, 2025
8166a77
Suggestion from Adam
JelleZijlstra Apr 2, 2025
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10 changes: 1 addition & 9 deletions Lib/_ast_unparse.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,8 +6,6 @@
from contextlib import contextmanager, nullcontext
from enum import IntEnum, auto, _simple_enum

__all__ = ('unparse',)

# Large float and imaginary literals get turned into infinities in the AST.
# We unparse those infinities to INFSTR.
_INFSTR = "1e" + repr(sys.float_info.max_10_exp + 1)
Expand Down Expand Up @@ -48,7 +46,7 @@ def next(self):
_MULTI_QUOTES = ('"""', "'''")
_ALL_QUOTES = (*_SINGLE_QUOTES, *_MULTI_QUOTES)

class _Unparser(NodeVisitor):
class Unparser(NodeVisitor):
"""Methods in this class recursively traverse an AST and
output source code for the abstract syntax; original formatting
is disregarded."""
Expand Down Expand Up @@ -1142,9 +1140,3 @@ def visit_MatchOr(self, node):
with self.require_parens(_Precedence.BOR, node):
self.set_precedence(_Precedence.BOR.next(), *node.patterns)
self.interleave(lambda: self.write(" | "), self.traverse, node.patterns)


def unparse(ast_obj):
unparser = _Unparser()
return unparser.visit(ast_obj)
unparse.__module__ = 'ast' # backwards compatibility
21 changes: 9 additions & 12 deletions Lib/ast.py
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Expand Up @@ -620,6 +620,15 @@ class AugStore(expr_context):
class Param(expr_context):
"""Deprecated AST node class. Unused in Python 3."""

_Unparser = None

def unparse(ast_obj):
global _Unparser
if _Unparser is None:
from _ast_unparse import Unparser as _Unparser
unparser = _Unparser()
return unparser.visit(ast_obj)


def main():
import argparse
Expand Down Expand Up @@ -651,15 +660,3 @@ def main():

if __name__ == '__main__':
main()

def __dir__():
dir_ = {n for n in globals() if not n.startswith('_') and n != 'sys'}
return sorted(dir_ | {'unparse'})

def __getattr__(name):
if name == 'unparse':
global unparse
from _ast_unparse import unparse
return unparse

raise AttributeError(f'module {__name__!r} has no attribute {name!r}')
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