@classmethod
    def source_language_code(cls, r):
        return r.source_language.code
L{NewsBuilder._writeHeader} accepts a file-like object opened for
dataset/ETHPy150Open rvanlaar/easy-transifex/src/transifex/transifex/resources/api.py/ResourceHandler.source_language_code--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/python/test/test_release.py/NewsBuilderMixin.test_writeHeader