python计算字符串长度(中文算2个字符)

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    txt = '名字12' 
    lenTxt = len(txt) 
    lenTxt_utf8 = len(txt.encode('utf-8')) 
    size = int((lenTxt_utf8 - lenTxt)/2 + lenTxt)

    print("size = " , size ," ,urf8 = ",lenTxt_utf8," ,len = " ,lenTxt)