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

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Merged
pablogsal merged 1 commit into from
Dec 23, 2019
Merged

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

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19 changes: 6 additions & 13 deletions Lib/ast.py
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Original file line number Diff line number Diff line change
Expand Up @@ -597,22 +597,15 @@ def buffer(self):
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):
Expand Down