How to write factorial in python?-Python Tutorial-php.cn

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)

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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

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[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

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