"Python" programming language Introduction Classic 100 cases--25

1 #题目: Beg for 1+2!+3!+...+20! 's and.

Code:

2 3 m = 0 4 for x in range (1,21): 5 s = 1 6 for y in range (1,x+1): 7 s *= y 8 m + = s 9 pri NT (' 1+2!+3!+...+20! ' and%d '%m)

Operation Result:

[[email protected] code_100]# python code_25.py 1+2!+3!+...+20! and for 2561327494111820313[[email protected] code_100]#

Code Explanation:

  #思路: The factorial value of each number is calculated first, and then the sum of all the factorial values is calculated and   2   3 m = 0                                   #m是求和累加, initialized to 0  4 for x  in range (1,21):                  #遍历1到20个数   5     s = 1                               #s是求累乘, initialized to 1, the position should be placed in the middle of the two for loop, each time the inner for loop is completed, the next for x start calculation will be reset 1   6     for y in range (1,x+1):             #这个for The value of  y is from 1 to X, which contains the values of all factorial   7              s *= y                     #将所有符合要求的数字相乘, you get the value of the factorial of the for x number   8      m += s                             #将这20个数的所有的阶乘值相加 to get the final result   9 print (' 1+2!+3!+...+20! ' and%d '%m ')      #打印这20个数的阶乘的和

This article is from the "Learning Notes" blog, so be sure to keep this source http://netsyscode.blog.51cto.com/6965131/1748652

"Python" programming language Introduction Classic 100 cases--25