bpo-38870: Remove dependency on contextlib to avoid performance regression on import (GH-17376)
https://bugs.python.org/issue38870 Automerge-Triggered-By: @pablogsal
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Lib/ast.py
20
Lib/ast.py
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@ -26,7 +26,6 @@
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"""
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import sys
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from _ast import *
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from contextlib import contextmanager
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def parse(source, filename='<unknown>', mode='exec', *,
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@ -597,15 +596,22 @@ class _Unparser(NodeVisitor):
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self._buffer.clear()
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return value
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@contextmanager
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def block(self):
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class _Block:
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"""A context manager for preparing the source for blocks. It adds
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the character':', increases the indentation on enter and decreases
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the indentation on exit."""
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self.write(":")
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self._indent += 1
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yield
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self._indent -= 1
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def __init__(self, unparser):
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self.unparser = unparser
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def __enter__(self):
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self.unparser.write(":")
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self.unparser._indent += 1
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def __exit__(self, exc_type, exc_value, traceback):
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self.unparser._indent -= 1
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def block(self):
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return self._Block(self)
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def traverse(self, node):
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if isinstance(node, list):
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