day-09 作业

1. 编写⼀个函数，求1+2+3+...+N

def my_sum(num:int):
    sum1 = 0
    for x in range(num+1):
        sum1 += x
    return sum1

2. 编写⼀个函数，求多个数中的最⼤值

def wjj_max(*args):
    max1=args[0]
    for num in args:
        if num > max1:
            max1=num
    return max1

3. 编写⼀个函数，实现摇⾊⼦的功能，打印n个⾊⼦的点数和

import random
def my_game(The_number_of_dice:int):
    input_str=input('输入1摇色子，输入end退出')
    if input_str == '1':
        sum1 = 0 #储存色子总点数
        count = 0
        for _ in range(The_number_of_dice):
            num1 = random.randint(1,6)
            count += 1
            print('第%d个色子点数为%d'%(count,num1))
            sum1 += num1
        return '%d个色子总点数是%d'%(The_number_of_dice,sum1)
    else:
        print('成功退出！！')
print(my_game(6))

4. 编写⼀个函数，交换指定字典的key和value。
   例如:{'a':1, 'b':2, 'c':3} ---> {1:'a', 2:'b', 3:'c'}

def exchange_dict(dict1:dict):
    dict2={}
    for key in dict1:
        dict2.setdefault(dict1[key],key)
    return dict2

print(exchange_dict({'a':1, 'b':2, 'c':3}))


dict1={'a':1, 'b':2, 'c':3}
gen2=dict((value,key) for key,value in dict1.items())
print(gen2)

5. 编写⼀个函数，三个数中的最⼤值

def my_max(*args):
    return max(*args)


print(my_max(1,2,3))

6. 编写⼀个函数，提取指定字符串中的所有的字⺟，然后拼接在⼀起后打例如：'12a&bc12d--' ---> 打印'abcd'

def joint_str(str1):
    str2=''
    for x in str1:
        if 'a' <= x <= 'z' or 'A' <= x <='Z':
            str2 += x
    return str2
print(joint_str('12a&bc12d--'))

7. 写⼀个函数，求多个数的平均值

def mean(*args):
    sum1 = 0
    for x in args:
        sum1 += x
    return sum1/len(args)

print(mean(10,20,30,40,50))

8. 写⼀个函数，默认求10的阶层，也可以求其他数的阶层

def factorial(num=10):
    product = 1
    for x in range(1,num+1):
        product *= x
    return product
print(factorial())

9. 写⼀个函数，可以对多个数进⾏不同的运算
   例如: operation('+', 1, 2, 3) ---> 求 1+2+3的结果
   operation('-', 10, 9) ---> 求 10-9的结果
   operation('', 2, 4, 8, 10) ---> 求 24810的结

def operation(str1:str,*args:float):
    if str1 == '+':
        sum = 0
        for x in args:
            sum += x
        return sum
    elif str1 == '-':
        list1=list(args)
        num = list1[0]
        for x in list1[1::]:
            num -= x
        return num
    elif str1 == '*':
        product = 1
        for x in args:
             product *= x
        return product
    elif str1 == '/':
        list1=list(args)
        num2 = list1[0]
        for x in list1[1::]:
            num2 /= x
        return  num2
    else:
        print('暂时不支持其他算法')



print(operation('+',24,4,6))   #  34
print(operation('-',24,4,6))   # 14
print(operation('*',24,4,6))  #  576
print(operation('/',24,4,6)) #1.0