第二步，文件搜索关键字 Mark

_ignoreList = [".png",".plist",".pch",""] #忽略名单 ,"" = 隐藏文件

def Search_keyword(path, keyWord):
    for root, dirs, files in os.walk(path):
        for name in files:
            if os.path.splitext(name)[-1] not in _ignoreList: #忽略扩展名
                fp = os.path.join(root, name)
                with open(fp,'r') as f:
                    i = 1
                    for line in f:
                        if keyWord in line:
                            print('%s 第%d行' % (fp,i))
                        i +=1