def split_field_action(s):
    if '__' in s:
        return s.rsplit('__', 1)
    return s, None
When called with L{NewsBuilder._DOC}, L{NewsBuilder._findChanges}
dataset/ETHPy150Open mozilla/elasticutils/elasticutils/__init__.py/split_field_action--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/python/test/test_release.py/NewsBuilderTests.test_findDocumentation