def _concat(df, _type):
    if (df is None):
        df = pd.DataFrame(_object_blocks[_type])
    else:
        _df = pd.DataFrame(_object_blocks[_type])
        df = pd.concat([df, _df], sort=True)
    return df
def _concat(df, _type):
    if (df is None):
        df = pd.DataFrame(_object_blocks[_type])
    else:
        _df = pd.DataFrame(_object_blocks[_type])
        df = pd.concat([df, _df], sort=True)
    return df