def _read_input(self):
        paths = self.args or ['-']
        for path in paths:
            for line in read_input(path, stdin=self.stdin):
                yield line
Test the _write_cell() method for formulas.
dataset/ETHPy150Open Yelp/mrjob/mrjob/job.py/MRJob._read_input--crossover with--dataset/ETHPy150Open jmcnamara/XlsxWriter/xlsxwriter/test/worksheet/test_write_cell.py/TestWriteCell.test_write_cell_formula02