cpython/Lib/packaging/tests/fixer/fix_echo2.py

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# Example custom fixer, derived from fix_raw_input by Andre Roberge
from lib2to3 import fixer_base
from lib2to3.fixer_util import Name
class FixEcho2(fixer_base.BaseFix):
BM_compatible = True
PATTERN = """
power< name='echo2' trailer< '(' [any] ')' > any* >
"""
def transform(self, node, results):
name = results['name']
name.replace(Name('print', prefix=name.prefix))