练习 1：仿照求 ∑mi=1i+∑ni=1i+∑ki=1i∑i=1mi+∑i=1ni+∑i=1ki 的完整代码，写程序，可求m!+n!+k!



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def product_sum(end):
    i = 1
    total_n = 1
    
    while i < end:
        i += 1
        total_n *= i
    return total_n

m = int(input("请输入第1个整数，以回车结束:"))
n = int(input("请输入第2个整数，以回车结束:"))
k = int(input("请输入第3个整数，以回车结束:"))

print("最终的和是：",product_sum(m)+product_sum(n)+product_sum(k))









    



请输入第1个整数，以回车结束:3
请输入第2个整数，以回车结束:4
请输入第3个整数，以回车结束:5
最终的和是： 150

练习 2：写函数可返回1-1/3+1/5-1/7...的前n项的和。在主程序中，分别令n=1000及100000，打印4倍该函数的和。



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def sum(n):
        i = 1
        total_n = 0
        while i <= n:
            total_n += (-1)**(n-1)*(1.0/(2*n-1))
            i += 1
        return total_n

print(4*sum(1000))
print(4*sum(100000))









    



-2.00100050025016
-2.0000100000531345

练习 3：将task3中的练习1及练习4改写为函数，并进行调用。



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#练习1
def star():
    name = input("please enter your name:")
    date = input("please enter your date of birth:")
    date=float(date)
    if 3.21 <= date <= 4.19:
        print(name,"，你是非常有性格的白羊座！")
    elif 4.20 <= date <= 5.20:
        print(name,"，你是非常有性格的金牛座！")
    elif 5.21 <= date <= 6.21:
        print(name,"，你是非常有性格的双子座！")
    elif 6.22 <= date <= 7.22:
        print(name,"，你是非常有性格的巨蟹座！")
    elif 7.23 <= date <= 8.22:
        print(name,"，你是非常有性格的狮子座！")
    elif 8.23 <= date <= 9.22:
        print(name,"，你是非常有性格的处女座！")
    elif 9.23 <= date <= 10.23:
        print(name,"，你是非常有性格的天秤座！")
    elif 10.24 <= date <= 11.22:
        print(name,"，你是非常有性格的天蝎座！")
    elif 11.23 <= date <= 12.21:
        print(name,"，你是非常有性格的射手座！")
    elif 1.20 <= date <= 2.18:
        print(name,"，你是非常有性格的水瓶座！")
    elif 2.19 <= date <= 3.20:
        print(name,"，你是非常有性格的双鱼座！")
    else:
        print(name,"，你是非常有性格的摩羯座！")
star()









    



please enter your name:mg
please enter your date of birth:10.25
<class 'float'>
mg ，你是非常有性格的天蝎座！



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#练习4
def conversion():
    word = input("please enter a word:")
    if word.endswith("x"):
        print(word,"es",sep = "")
    elif word.endswith("sh"):
        print(word,"es",sep = "")
    else:
        print(word,"s",sep = "")
    
conversion()









    



please enter a word:put
puts

挑战性练习：写程序，可以求从整数m到整数n累加的和，间隔为k，求和部分需用函数实现，主程序中由用户输入m，n，k调用函数验证正确性。



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def sum():
    i = m
    total = 0
    while i <= n:
        total += i
        i += k
        
    return total
    
m = int(input("please enter an integer:"))
n = int(input("please enter a biger integer:"))
k = int(input("please enter interval between two numbers:"))
    
print("最终的和是：",sum())









    



please enter an integer:2
please enter a biger integer:11
please enter interval between two numbers:3
最终的和是： 26



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