day8 作业

1. 编写⼀一个函数，求1+2+3+...+N

def sum1(N):
    sum1 = 0
    for x in range(N+1):
        sum1 += x
    print(sum1)

2.编写⼀一个函数，求多个数中的最⼤大值

def max1(*num1):
    max2 = num1[0]
    for item in num1:
        if item > max2:
            max2 = item
    print(max2)

3.编写⼀一个函数，实现摇⾊色⼦子的功能，打印n个⾊色⼦子的点数和

def sums(n):
    import random
    sums = 0
    num1 = 0
    while num1 <= n:
        num2 = random.randint(1, 6)
        sums += num2
        num1 += 1
    print(sums)

4.编写⼀一个函数，交换指定字典的key和value。

例例如:{'a':1, 'b':2, 'c':3} ---> {1:'a', 2:'b', 3:'c'}

def swop(dict1):
    dict2 = {}
    for key in dict1:
        value1 = dict1[key]
        dict2[value1] = key
    print(dict2)

5.编写⼀一个函数，三个数中的最⼤大值

def max2(x, y, z):
    if x > y and x > z:
        print(x)
    elif y > x and y > z:
        print(y)
    elif z > x and z > y:
        print(z)

6.编写⼀一个函数，提取指定字符串串中的所有的字⺟母，然后拼接在⼀一起后打印出来

例如：'12a&bc12d--' ---> 打印'abcd'

def letter(str1):
    str2 = ''
    for item in str1:
        if 'a' <= item <= 'z' or 'A' <= item <= 'Z':
            str2 += item
        print(str2)

7.写⼀一个函数，求多个数的平均值

def avarage(*num2):
    sum1 = 0
    for item in num2:
        sum1 += item
        avarage = sum1 /len(num2)
    print(avarage)

8.写⼀一个函数，默认求10的阶层，也可以求其他数的阶层

def factorial(num1):
    if isinstance(num1, int):
        product = 1
        for num1 in range(1, 11):
            product *= num1
        print(product)
    else:
        product = 1
        for num1 in range(1, num1+1):
            product *= num1
        product

9.写⼀一个函数，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的结构

def operation(sign, *nums):
    num1 = nums[0]
    if sign == '+':
        for num1 in range(1, len(nums)+1):
            num1 += num1
        print(num1)
    elif sign == '-':
        for num1 in range(1, len(nums)+1):
            num1 -= num1
        print(num1)
    elif sign == '*':
        for num1 in range(1, len(nums)+1):
            num1 *= num1
        print(num1)
    elif sign == '/':
        for num1 in range(1, len(nums) + 1):
            num1 /= num1
        print(num1)
    elif sign == '**':
        for num1 in range(1, len(nums)+1):
            num1 **= num1
        print(num1)
    elif sign == '//':
        for num1 in range(1, len(nums)+1):
            num1 //= num1
        print(num1)
    elif sign == '%':
        for num1 in range(1, len(nums)+1):
            num1 %= num1
        print(num1)