2018-08-29作业

1.编写一个函数，求1+2+3+...+N

def sum_he(*number):
    sum = 0
    # 取出每一个元素
    for item in number:
        # 元素求和
        sum += item
    print(sum)
sum_he(1,2,3)
print('==========')

2.编写一个函数，求多个数中的最大值

def max_number(*number):
    max_number = max(number)
    print(max_number)
max_number(1,5,2,4,9,10,20,50,100)
print('==========')

3.编写一个函数，实现摇色子的功能，打印n个色子的点数

def shai_number(n):
    import random
    count = []
    for x in range(1,n+1):
        number = random.randint(1,6)
        count.append(number)
    return count
count = shai_number(7)
print(count)
print('==========')

4.编写一个函数，交换指定字典的key和value

def change_dict(dict1:dict):
    dict2 = {} # 建立一个空的字典
    for key1 in dict1:
        dict2[dict1[key1]] = key1
    return dict2

dict1 ={'a':1,'b':2,'c':3}
dict2 = change_dict(dict1)
print(dict2)
print('==========')

5.编写一个函数，三个数中的最大值

def max_number1(*number1):
    max_number1 = max(number1)
    print(max_number1)
max_number1(7,8,9)
print('==========')

6.编写一个函数，提取指定字符串中的所有字母，然后拼接在一起后打印出来

def str1(a):
    str2 = ''
    for x in a:
        if x.isalpha():
            str2 += x
    return str2
str2 = str1('12a&bc12d')
print(str2)
print('==========')

7.写一个函数，求多个数的平均值

def mean1(*number3):
    sum1 = 0
    for item in number3:
        sum1 += item
        long = len(number3)
    mean2 = int (sum1/long)
    return mean2
mean1(1,2,3)
mean2 = mean1(1,2,3)
print(mean2)
print('==========')

8.写一个函数，默认求10！，也可以求其他数的阶乘

def jie_cheng(number4 = 10):
    fac = 1
    for x in range(1,number4+1):
        fac *= x
    return fac
fac = jie_cheng(5)
print(fac)
print('==========')

9.写一个函数，可以对多个数进行不同的运算

def operation (a:str,*number9):
    if a == '+':
        new_operation = 0
        for item in number9:
            new_operation += item
            print(new_operation)
        return new_operation
    elif a == '-':
        new_operation = 0
        for item in number9:
            new_operation -= item
            print(new_operation)
        return new_operation
    elif a == '*':
        new_operation = 1
        for item in number9:
            new_operation *= item
            print(new_operation)
        return new_operation
    else :
        new_operation = 1
        for item in number9:
            new_operation /= item
            print(new_operation)
        return new_operation

print(operation('+',1,2,3,4,5))