csvreader.py 文件源码

def _py2_get_file_object(csvfile, encoding):
        if isinstance(csvfile, str):
            return open(csvfile, 'rb')  # <- EXIT!

        if hasattr(csvfile, 'mode'):
            assert 'b' in csvfile.mode, ("When using Python 2, file must "
                                         "be open in binary mode ('rb').")
        elif issubclass(csvfile.__class__, io.IOBase):
            assert not issubclass(csvfile.__class__, io.TextIOBase), ("When using Python 2, "
                                                                      "must use byte stream "
                                                                      "(not text stream).")
        return csvfile