How to write factorial in python?

How to write factorial in python?

How to write factorial in Python:

1. Calculation of factorial: Using a recursive function is a better solution. First define a recursive function to implement the calculation. factorial function.

def  recursion(n):   #'定义递归函数实现求阶乘功能'
    if n==1:
        return 1
    else:
        return  n*recursion(n-1)

2. Sum: (1) You can sum directly. You can also define a list, append the factorial results obtained by for traversal to the list, and then use the sum() function to sum.

Sum=0
print("for循环直接调用递归函数求和".center(80,"*"))
for  i  in range(1,21):
    Sum +=recursion(i)
print(Sum)
   
列表求和方案：
list=[] #定义一个空的列表，将调用递归函数生成的阶乘值追加到列表
print("将1-20的阶乘写入列表，使用sum函数求和".center(80,"*"))
for  i  in range(1,21):
    list.append(recursion(i))# 将调用递归函数生成的阶乘值追加到列表
print(sum(list)) #列表求和

[Complete source code] and results:

def  recursion(n): #'定义递归函数实现求阶乘功能'
    if n==1:
        return 1
    else:
        return  n*recursion(n-1)
 
 
list=[ ] #定义一个空的列表，将调用递归函数生成的阶乘值追加到列表
for  i  in range(1,21):
    list.append(recursion(i))# 将调用递归函数生成的阶乘值追加到列表
print(sum(list)) #列表求和
 
 
 
Sum = 0
for  i  in range(1,21):
    Sum +=recursion(i)
print(Sum)
 
 
结果：
2561327494111820313

Recommended tutorial: "python video tutorial"

The above is the detailed content of How to write factorial in python?. For more information, please follow other related articles on the PHP Chinese website!