python在文件中倒序查找个关键词

python在文件中倒序查找个关键单词，忽略大小写来匹配，并将关键单词所在行作为结果返回，以单词输入顺序作为优先度实现返回（目前只返回第1个单词所在行，可实现多个返回）

#coding = utf-8

# @author :  dj
import re


#  the second param  你想要寻找的字母（顺序影响结果，顺序即优先度）
# 调用方式： （fname，copyright,source)

def extractOriginalAgency(fname,*dependingList):
    count_ = len(dependingList)
    result = ["none"] * count_
    n =0
    with open(fname, 'r', encoding='utf-8') as f:


        try:
            lines = f.readlines() #读取所有行
            i = 0
            while(True):
                # find from the ending of the passage

                string = lines[i]

                for j in range(0,count_):
                    if(result[j] == "none" ):
                        if (match(string,dependingList[j])):
                    #         匹配成功
                            result[j] =string
                            n = n+1

# 当找到所有单词是即不必再往下找
                if(n == count_):
                    break

                i += 1;
        except:
            pass

    #     找到目标所在行后
        finResult = "none"
        temp = "none"
    #   优先返回有 
        for z in range(0,count_):
            if(temp =="none" and result[z] !="none" ):
                temp = result[z]
        if(finResult =="none"):
            finResult = temp

    return finResult


def match(string,reString):
#     用restring 匹配string
    matchObj = re.match(reString,string,re.IGNORECASE)

    if(matchObj):
        return True
    else:
        return False