任务一：

def calc(a, b, op):
    if op == "+":
        return add(a, b)

    elif op == "-":
        return sub(a, b)
    elif op == '*':
        return mul(a, b)
    elif op == "/":
        if b!= 0:
            return div(a, b)
        else:
            return '除数不能为0'
    else:
        print("输入的运算符不正确！！")



def add(a, b):
    return a + b

def sub(a, b):
    return a - b

def mul(a, b):
    return a * b

def div(a, b):
    return a / b


if __name__ == '__main__':
    a = int(input('请输入第一个整数：'))
    b = int(input('请输入第二个整数：'))
    op = input('请输入运算符：')
    print(calc(a, b, op))

任务二：

import  random
def guess(num,guess_num):
    if num == guess_num:
        return 0
    elif guess_num>num:
        return 1
    else:
        return -1
num = random.randint(1, 100)
for i in range(10):
    guess_num = int(input('我心里有个【1-100】的整数请你猜一下：'))
    result = guess(num, guess_num)
    if result == 0:
        print('猜对了')
        break
    elif result ==1:
        print('大了')
    else:
        print('小了')
else:
    print('真笨，10次都没有猜中！')