day007 作业 7-24

1.编写一个函数，求1+2+3+...+N

• 实现程序

def get_sum(n):
    sum1 = 0
    for i in range(1, n + 1):
        sum1 += i
    return sum1

print(get_sum(100))

Outout:
5050

2.编写一个函数，求多个数中的最大值

• 实现程序

def get_max(*numbers):
    max_number = 0
    for number in numbers:
        if max_number > number:
            max_number = max_number
        else:
            max_number = number
    return max_number

print(get_max(15, 10, 60))

Output:
60

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

• 实现程序

def get_point_sum(n):
    point_sum = 0
    for _ in range(1, n + 1):
        point_number = randint(1, 7)  # 色子产生点数
        print(point_number, end=' ')  # 将每次产生的点数打印出来
        point_sum += point_number  # 求和点数
    return point_sum

print('\n', get_point_sum(4))

Output:
4 6 2 3 
 15

4.编写一个函数，交换指定字典的key和value。

• 实现程序

def exchange_key_and_value(dic):
    dic = dict((v, k) for k, v in dic.items())  # 将字典转换为元组后交换每个元组元素值，再将元组转换成字典
    return dic
dict_demo = {'name': '1', 'age': 23}
print(exchange_key_and_value(dict_demo))

Output:
{'1': 'name', 23: 'age'}

5.编写一个函数，求三个数中的最大值

• 实现程序

def get_max_in_three_numbers(a, b, c):
    max_number = a
    if a > b:
        max_number = a
        if max_number > c:
            max_number = max_number
        else:
            max_number = c
    else:
        max_number = b
        if max_number > c:
            max_number = max_number
        else:
            max_number = c
    return max_number

print(get_max_in_three_numbers(9, 5, 46))

6.编写一个函数，提取指定字符串中的所有的字母，然后拼接在一起打印出来

• 实现程序

def get_all_letters(string):
    all_letters = ''
    for char in string:
        if 'a' < char < 'z' or 'A' < char < 'Z':
            all_letters += char
    return all_letters

string = 'bcr72h dfy8g 8yfwfw  8 feh vy8qw'
print(get_all_letters(string))

Output:
bcrhdfygyfwfwfehvyqw

7.编写一个函数，求多个数的平均值

• 实现程序

def get_avg(*numbers):
    number_sum = 0
    for number in numbers:
        number_sum += number
    avg = number_sum / len(numbers)
    return avg

print(get_avg(1, 6, 5))

Output:
4.0

8.编写一个函数，默认求10的阶乘，也可以求其他数的阶乘

• 实现程序

def get_factorial(n=10):
    factorial = 1
    for i in range(1, n + 1):
        factorial *= i
    return factorial

print(get_factorial())

Output:
3628800

9.编写一个函数，可以对多个数进行不同的运算

• 实现程序

def operation(operator, *numbers):
    mul_result = 1
    add_result = 0
    sub_result = 2 * numbers[0]
    for number in numbers:
            mul_result *= number
            add_result += number
            sub_result -= number
    if operator == '*':
        return mul_result
    elif operator == '+':
        return add_result
    else:
        return sub_result

print(operation('+', 1, 2, 3))
print(operation('-', 10, 9))
print(operation('*', 2, 4, 8, 10))

Output:
6
1
640