def raw(self, fileids=None):
        if fileids is None: fileids = self._fileids
        elif isinstance(fileids, string_types): fileids = [fileids]
        raw_texts = []
        for f in fileids:
            _fin = self.open(f)
            raw_texts.append(_fin.read())
            _fin.close() 
        return concat(raw_texts)
Use to progressively zero in on return value issues.
dataset/ETHPy150Open nltk/nltk/nltk/corpus/reader/plaintext.py/PlaintextCorpusReader.raw--crossover with--dataset/ETHPy150Open miklevin/pipulate/common.py/gotcha