错误：UnboundLocalError: local variable 'xxx' referenced before assignment

# -*- coding:utf-8 -*-def addr_to_lenth(jsonlist):    t = len(jsonlist)    i = 0    typelist = list()    while i < t :        for j in range(i+1,t):            if jsonlist[i]['起始地址'] + jsonlist[i]['长度'] == jsonlist[j]['起始地址'] and j-i-1 < 9:                jsonlist[i]['长度'] += jsonlist[j]['长度']                jsonlist[i]['采集数据类型'] = jsonlist[i]['采集数据类型'] + ',' + jsonlist[j]['采集数据类型']                jsonlist[i]['id'] = jsonlist[i]['id'] + ','+ jsonlist[j]['id']            else:                break        typelist.append(jsonlist[i])        if i + 1 < j:            i = j        else:            i += 1    return typelistdef sort(jsonlist):#冒泡排序，按地址大小重新排序    for i in range(len(jsonlist)-1):        for j in range(len(jsonlist)-1-i):            if jsonlist[j]['起始地址'] > jsonlist[j+1]['起始地址']:                addrlist[j],addrlist[j+1] = addrlist[j+1],addrlist[j]    return jsonlistdef add_lenth(jsonlist):    for i in range(len(jsonlist)):        if jsonlist[i]['采集数据类型'] not in ('int16', 'uint16'):            jsonlist[i]['长度'] = 2        else:            jsonlist[i]['长度'] = 1    return jsonlistdef tear_down(jsonlist):    for item in jsonlist:        for i in range(len(item['采集数据类型'])):            passdef run(jsonlist):    addrlist_sort = sort(jsonlist)    addlenth = add_lenth(addrlist_sort)    t = addr_to_lenth(addlenth)    return tif __name__=="__main__":    addrlist = [        {"采集数据类型": "float",  "起始地址": 400012, "串口网口": "192.168.0.106:502", "id": "MID10001"},        {"采集数据类型": "float",  "起始地址": 400114, "串口网口": "192.168.0.106:502", "id": "MID20002"},        {"采集数据类型": "float",  "起始地址": 400014, "串口网口": "192.168.0.106:502", "id": "MID10002"},        {"采集数据类型": "int16",  "起始地址": 400016, "串口网口": "192.168.0.106:502", "id": "MID10003"},        {"采集数据类型": "float",  "起始地址": 400017, "串口网口": "192.168.0.106:502", "id": "MID10004"},        {"采集数据类型": "int16",  "起始地址": 400019, "串口网口": "192.168.0.106:502", "id": "MID10005"},        {"采集数据类型": "float",  "起始地址": 400020, "串口网口": "192.168.0.106:502", "id": "MID10006"},        {"采集数据类型": "int16",  "起始地址": 400022, "串口网口": "192.168.0.106:502", "id": "MID10006"},        {"采集数据类型": "int16",  "起始地址": 400023, "串口网口": "192.168.0.106:502", "id": "MID10006"},        {"采集数据类型": "int16",  "起始地址": 400024, "串口网口": "192.168.0.106:502", "id": "MID10006"},        {"采集数据类型": "float",  "起始地址": 400025, "串口网口": "192.168.0.106:502", "id": "MID10007"},        {"采集数据类型": "float",  "起始地址": 400027, "串口网口": "192.168.0.106:502", "id": "MID10008"},        {"采集数据类型": "float",  "起始地址": 400029, "串口网口": "192.168.0.106:502", "id": "MID10009"},        {"采集数据类型": "float",  "起始地址": 400031, "串口网口": "192.168.0.106:502", "id": "MID10009"},        {"采集数据类型": "float",  "起始地址": 400033, "串口网口": "192.168.0.106:502", "id": "MID10009"},        {"采集数据类型": "float",  "起始地址": 400035, "串口网口": "192.168.0.106:502", "id": "MID10009"},        {"采集数据类型": "float",  "起始地址": 400037, "串口网口": "192.168.0.106:502", "id": "MID10009"},        {"采集数据类型": "int16",  "起始地址": 400039, "串口网口": "192.168.0.106:502", "id": "MID10009"},        {"采集数据类型": "float",  "起始地址": 400040, "串口网口": "192.168.0.106:502", "id": "MID10010"}    ]    t  = run(addrlist)    print t

程序手动运行该程序是不会报错的，但当其他程序调用时就会出现错误：line15:UnboundLocalError: local variable 'j' referenced before assignment

修改：

def addr_to_lenth(jsonlist):    t = len(jsonlist)    i = 0    typelist = list()    while i < t :
s = 0        for j in range(i+1,t):            if jsonlist[i]['起始地址'] + jsonlist[i]['长度'] == jsonlist[j]['起始地址'] and j-i-1 < 9:                jsonlist[i]['长度'] += jsonlist[j]['长度']                jsonlist[i]['采集数据类型'] = jsonlist[i]['采集数据类型'] + ',' + jsonlist[j]['采集数据类型']                jsonlist[i]['id'] = jsonlist[i]['id'] + ','+ jsonlist[j]['id']
s = j            else:
s = j                break        typelist.append(jsonlist[i])        if i + 1 < s:            i = s        else:            i += 1    return typelist