day7-作业

1.编写一个函数，求1+2+3+...+N

def sum1(num):
    sum1 = 0
    for i in range(0,num+1):
        sum1 += i
    print(sum1)
sum1(5)

15

Process finished with exit code 0

2.编写一个函数，求多个数中的最大值

def my_max(*num):
    a = max(num)
    print(a)
my_max(6,5,9,8,2)

9

Process finished with exit code 0

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 ysz():
    sum1 = 0
    nums = []#存储色子的点数
    for i in range(3):#摇3次色子
        num = random.randint(1,6)
        nums.append(num)
        sum1 += num
    print(nums)
    print(sum1)
ysz()

[3, 6, 6]
15

Process finished with exit code 0

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(dict1):
    new_dict = {}
    for key in dict1:
        value = dict1.get(key)
        new_dict[value] = key
    print(new_dict)
exchange({'a':1,'b':2,'c':3})

{1: 'a', 2: 'b', 3: 'c'}

Process finished with exit code 0

5.编写一个函数，三个数中的最大值

def my_max(num1,num2,num3):
    a = max(num1,num2,num3)
    print(a)
my_max(8,22,3)

22

Process finished with exit code 0

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印出来

例如：'13as8(*&hj2d' ---> 打印'ashjd'

方法一：
def tq_str(str1):
    for i in str1:
        if i.isalpha():
            print(i,end='')

tq_str('sa1ls231')

方法二：
def tq_str(str1):
    a = ''
    for i in str1:
        if 'a' <= i <='z' or 'A'<= i <='Z':
            a +=  str(i)
    print(a)
tq_str('sa1ls231')

方法三：
def tq_str(str1):
    for i in str1:
        if 'a' <= i <='z' or 'A'<= i <='Z':
            print(i,end='')
tq_str('sa1ls231')

sals
Process finished with exit code 0

7.写一个函数，求多个数的平均值

def my_aver(*num):
    print(sum(num)/len(num))
my_aver(2,4,6,8,8)

5.6

Process finished with exit code 0

8.写一个函数，默认求10的阶层，也可以求其他数的阶层

def jc(a,b=10):
    s = 1
    for i in range(1,a+1):
        s *= i
    print(s)
    m = 1
    for j in range(1,11):
        m *= j
    print(m)
jc(6)

720
3628800

Process finished with exit code 0

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, 6, 8, 10) ---> 求 2 * 6 * 8 * 10 的结果

def operation(char,*num):
    if char == '+':
        print(sum(num))
    elif char == '-':
        if len(num):
            sum1 = num[0]
            for i in range(len(num)):
                # 如果下标不是0，就减
                if i:
                    sum1 -= num[i]
                else:
                    pass
            print(sum1)
    elif char == '*':
        s = 1
        for i in num:
            s *= i
        print(s)
operation('+',5,4,6,8)
operation('-',5,4,3)
operation('*',5,4,6)

23
-2
120

Process finished with exit code 0