def read(self, filename):
        if self.base_dir:
            filename = (self.base_dir, filename) % '%s/%s'
        k = self.bucket.get_key(filename)
        if not k:
            return None
        return k.read()
dataset/ETHPy150Open lepture/flask-storage/flask_storage/s3.py/S3Storage.read/swapped operands of `%`