python解析字符串中的省市区字符串

#python解析字符串中的省市区字符串

#str4 = "XX省XX市辛桥乡赵庄村XX号"
#str4 = "XX省XX市XX区八卦二路XX号XX栋XX楼"
#str4 = "XX市XX区老山东里XX栋XX门XX号"
#str4 = "XX省XX县XX镇张大楼行政村张大楼自然村XXX号"
str4 = "XX市XX区侨雅新街XX号XXX房"

# python怎么判断字符串是否为空
if len(str4) > 0:
    try:
        ##正常情况下
        index1 = str4.index("省");
        addr1 = str4[:str4.index("省")+1]
        print("main-addr1="+addr1)

        index2 = str4.index("市");
        addr2 = str4[index1+1:str4.index("市")+1]
        print("main-addr2=" + addr2)

        index3 = str4.index("区");
        addr3 = str4[index2+1:str4.index("区")+1]
        print("main-addr3=" + addr3)

    except ValueError as e:
        try:
            index2 = str4.index("市");
            addr2 = str4[:str4.index("市")+1]
            print("err-addr2=" + addr2)

            index3 = str4.index("区");
            addr3 = str4[index2+1:str4.index("区")+1]
            print("err-addr3=" + addr3)

        except ValueError as e:
            try:
                index3 = str4.index("区");
                addr3 = str4[:str4.index("区")+1]
                print("err-addr3=" + addr3)
            except ValueError as e:
                try:
                    index3 = str4.index("县");
                    addr3 = str4[:str4.index("县") + 1]
                    print("err-addr3-2=" + addr3)
                except ValueError as e:
                    print("not find")