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Revert "bpo-38870: Remove dependency on contextlib to avoid performance regression on import (GH-17376)" (GH-17687)

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This reverts commit ded8888fbc.
This commit is contained in:
Pablo Galindo 2019-12-23 16:42:48 +00:00 • committed by GitHub
parent 4b3b1226e8
commit d69cbeb99d
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1 changed files with 6 additions and 13 deletions
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19
Lib/ast.py
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@ -597,22 +597,15 @@ class _Unparser(NodeVisitor):
self._buffer.clear()
return value
class _Block:
@contextmanager
def block(self):
"""A context manager for preparing the source for blocks. It adds
the character':', increases the indentation on enter and decreases
the indentation on exit."""
def __init__(self, unparser):
self.unparser = unparser
def __enter__(self):
self.unparser.write(":")
self.unparser._indent += 1
def __exit__(self, exc_type, exc_value, traceback):
self.unparser._indent -= 1
def block(self):
return self._Block(self)
self.write(":")
self._indent += 1
yield
self._indent -= 1
@contextmanager
def delimit(self, start, end):