问题 Failed to obtain/convert traceback!

Question

问题遇到的现象和发生背景

pyinstaller封装exe时出现如下报错
Failed to obtain/convert traceback!

Failed to execute script 'Library_system' due to unbandled exception: local variable 'Num' referenced before assignment

问题相关代码，请勿粘贴截图

所涉及相关如下

    # 判断这本书此前状态     @报错地址，出错原因 执行脚本“Library_system”失败，原因是未处理的异常:局部变量“Num”在赋值前被引用
    def JudgeBookstate(self,BookNum):
        global Alldata
        print("判断数据状态开始！")
        print(Alldata)
        # 解析图书编号在数据库的位置
        Temp = TransDictionarics_Book.DicbookNum.get(BookNum)
        for i in range(len(Alldata)):
            if Alldata[i][0] == Temp:
                Num = i
                break
            else: pass
        Readstate = Alldata[Num]
        Readstate = Readstate[len(Readstate) - 1]
        Readstate = Readstate.split("_")
        # 借阅情况
        Readbook = Readstate[1]
        # 确定本次借阅的状态T  0为未借阅，1为借阅
        if Readbook == '0': Readbook = "已还书"
        elif Readbook == '2': Readbook = "已入库"
        else: Readbook = "已借阅"
        # 借阅人
        print(Readstate[2])
        Readpeople = TransDictionarics_Book.Dicpeople.get(Readstate[2])
        # 上次借阅时间
        SystemTime = Readstate[0]
        # 解析图书名称
        BookName = outDictionarics_Book.DicbookNum.get(BookNum)
        # 解析图书借阅次数
        ReadNum = len(Alldata[BookNum]) - 1
        print(ReadNum)
        if self.is_event(ReadNum) == 1: ReadNum = ReadNum / 2
        else: ReadNum = (ReadNum - 1) / 2
        print(ReadNum)

        # 返回值  书的序号，编号，书名，借阅人，状态，借阅时间，借阅次数
        return BookNum ,Temp, BookName, Readpeople, Readbook, SystemTime, str(int(ReadNum))

Answer 1

上面的问题，我试过更改Num的名称也不行，还是会出错的，同样问题