writer.py 文件源码

def open(self):
        if self.is_open:
            self._ui.debug('OPEN CALLED ON ALREADY OPEN RUNCONTEXT')
            return
        self.is_open = True
        self._ui.debug('OPEN CALLED ON RUNCONTEXT')
        csv.register_dialect('dataset_dialect', **self.dialect)
        csv.register_dialect('writer_dialect', **self.writer_dialect)
        self.dialect = csv.get_dialect('dataset_dialect')
        self.writer_dialect = csv.get_dialect('writer_dialect')
        self.db = shelve.open(self.file_context.file_name, writeback=True)
        if six.PY2:
            self.out_stream = open(self.out_file, 'ab')
        elif six.PY3:
            self.out_stream = open(self.out_file, 'a', newline='')