def is_kanji(text, start_block=u'\u4e00', end_block=u'\u9fff'):
    """Check if all characters in text are kanji character. [CJK Unified Ideographs 4E00-9FFF Common]"""
    res = True
    for t in text:
        if t < start_block or t > end_block:
            res = False
            break
    return res