2018-08-29 课后作业(day8)

1.编写一个函数,求1+2+3+N

def num(n):
    sum = 0
    for n in range(n+1):
        sum += n
    return sum
n = int(input('请输入你想要计算的数字:'))
result = num(n)
print(result
# 结果:
请输入你想要计算的数字:55
1540

2.编写一个函数,求多个数中的最大值

def num(list1:list):
    max = 0
    for item in list1:
       if item > max:
           max = item
    return max
result = num([1,352,43215,5436,314])
print(result)
# 结果:43215

3.编写一个函数,实现一个摇骰子的功能,打印n
个骰子的和。

import random
def tou_zi(n,number):
    sum = 0
    for x in range(n):
        sum += number
    return sum
n = int(input('请问你要摇几个骰子:'))
result = tou_zi(n,random.randint(1,6))
print(result)
#结果:
请问你要摇几个骰子:7
24

4、编写一个函数,交换指定字典的key和value。

def exchange(dict1:dict):
    dict2 = {}
    for key,value in dict1.items():
        dict2[value] = key
    return dict2
result = exchange({'a':1,'b':2,'c':3})
print(result)
#结果:{1: 'a', 2: 'b', 3: 'c'}

5.编写一个函数,三个数中的最大值

def three_number(a,b,c):  
#可以直接 return max(a,b,c)
   if a > b > c:
       return a
   elif b > a > c:
       return b
   else:
       return c
a = int(input('请输入一个数字:'))
b = int(input('请输入一个数字:'))
c = int(input('请输入一个数字:'))
result = three_number(a,b,c)
print(result)
#结果: 
请输入一个数字:12
请输入一个数字:18
请输入一个数字:10
18

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 eng1(char1):
    char2 = ''
    for char in char1:
        if char.isalpha():
            char2 += char
    return char2
result = eng1('12a&bc12d--')
print(result)
结果:abcd

7.编写一个函数,求多个数的平均值

def avge(number):
    sum = 0
    avg = 0
    for index in range(len(number)):
        sum += number[index]
        continue
    avg = sum / index
    return avg
number = [10,214,3215,325235,5235]
result = avge(number)
print(result)
# 结果:83477.25

8.写一个函数,默认求10的阶乘,也可以求其他数的阶乘。

def jie_cheng(number = 10):
    sum = 1
    for x in range(1,number+1) :
        sum *= x
    return sum
result = jie_cheng()
print(result)
# 结果:3628800

9.写一个函数,可以对多个数进行不同的运算

def operation(str1,*number):
    count = 0
    count2 = 1
    if str1 == '+':
        for n in number[:]:
            count += n
        return count
    elif str1 == '-':
        count = number[0]
        for n in number[1:]:
            count -= n
        return count
    elif str1 == '*':
        for n in number[:]:
            count2 *= n
        return count2
    elif str1 == '/':
        count2 = number[0] / number[1]
        return count2
    elif str1 == '**':
        count2 = number[0]**number[1]
        return count2
    elif str1 == '//':
        count2 = number[0] // number[1]
        return count2
    elif str1 == '%':
        count2 = number[0] % number[1]
        return count2
    else:
        print('不支持这种运算符')
print(operation('+',2,3,5,6))
print(operation('-',2,3,5,6))
print(operation('*',2,3,5,2))
print(operation('/',2,3))
print(operation('//',2,3))
print(operation('**',2,3))
print(operation('%',2,3))

result:
16
-12
60
0.6666666666666666
0
8
2

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