老师，运行之后我输入的猜测数字为空字符串或者浮点数的话，会报错，两个报错内容一样，这个该修改哪里呢

# coding:utf-8

import random
import sys
from datetime import datetime

class Guess_num_game(object):
    def __init__(self):
        pass

    def guide_page(self, guide_word):
        # 输出标题
        self.guide_word = '欢迎进入数字猜猜猜小游戏'
        print('{}{}{}'.format('*' * 50, self.guide_word, '*' * 50))

    def all_num(self, n):
        # 判断n是否为数字，并返回结果
        return n.isdigit()

    def num_legal(self, ls):
        self.ls = ls
        # 判断起始值和终止值大小
        if int(ls[0]) == int(ls[-1]):
            print('您输入的区间数字相同！！请重新启动程序。')
        elif int(ls[0]) > int(ls[-1]):
            print('您输入的数字区间大小有误！！请重新启动程序。')
        else:
            return 1
        sys.exit()

    def set_final_num(self, num1, num2):
        # 利用filter函数过滤以确保输入值全为数字
        num_range = list(filter(self.all_num, [num1, num2]))
        # 若全是数字，则_filter列表里应该由两个字符
        if len(num_range) == 2:
            _legal = self.num_legal(num_range)
            if _legal == 1:
                print('所产生的随机数字区间为: %s' % num_range)
                return random.randint(int(num1), int(num2))
        else:
            print('您所输入的为非数字字符, 请重新启动！')
            sys.exit()

    def check_num_legal(self, num):
        # 判断用户输入的猜测数字是否在随机区间内
        if int(num) < int(self.ls[0]) or int(num) > int(self.ls[-1]):
            print('对不起您输入的数字未在指定区间！！！')

            return 1

    def write_record(self, times, value):
        value_ = '第{}次您猜测的数字为:{}'.format(times, value)
        now = datetime.now()
        with open('record.txt', 'a', encoding='utf-8') as f:
            f.write(f'\n{now}:{value_}')

    def main(self, rand1):
        temp = 0
        while True:
            guess_num = input('请继续输入您猜测的数字:')
            # 判断猜测数字是否为数字类型
            if self.all_num(guess_num):
                guess_num = int(guess_num)
            else:
                print('您所输入的为非数字字符, 请重新启动！')
            # 判断猜测数字是否在指定区间
            if self.check_num_legal(guess_num):
                continue
            temp += 1
            # 调用日志写入函数，传入猜测的次数和用户猜测的数字
            self.write_record(temp, guess_num)
            print('*' * 10)
            # 判断猜测数字与随机数字的大小比较
            if guess_num < rand1:
                print('Lower than the answer')
            elif guess_num > rand1:
                print('Higher than the answer')
            else:
                print('恭喜您！只用了%s次就赢得了游戏' % temp)
                break

if __name__ == '__main__':
    guess_num = Guess_num_game()
    print(guess_num.guide_page(guide_word='欢迎进入数字猜猜猜小游戏'))
    i = input('数字区间起始值:')
    j = input('数字区间终止值:')
    rand = guess_num.set_final_num(i, j)
    guess_num.main(rand)

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