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Python math.factorial()用法及代码示例


在Python中,数学模块包含许多数学运算,可以使用该模块轻松执行。math.factorial()函数返回所需数字的阶乘。

用法: math.factorial(x)

参数:
x: This is a numeric expression.

返回:  factorial of desired number.

代码1:

# Python code to demonstrate the working of factorial() 
    
# importing "math" for mathematical operations  
import math  
    
x = 5
    
# returning the factorial 
print ("The factorial of 5 is:", end ="")  
print (math.factorial(x))
输出:
The factorial of 5 is:120

代码2:

# Python code to demonstrate the working of factorial() 
  
# importing "math" for mathematical operations  
import math  
  
x = 5
y = 15
z = 8
  
# returning the factorial 
print ("The factorial of 5 is:", math.factorial(x)) 
print ("The factorial of 15 is:", math.factorial(y)) 
print ("The factorial of 8 is:", math.factorial(z))

输出:

The factorial of 5 is: 120
The factorial of 15 is: 1307674368000
The factorial of 8 is: 40320


代码3:如果x不是整数,则引发ValueError

# Python code to demonstrate the working of factorial() 
    
# importing "math" for mathematical operations  
import math  
    
# when x is not integer 
print ("math.factorial(13.7):", math.factorial(13.7))

输出:

ValueError:factorial() only accepts integral values


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注:本文由纯净天空筛选整理自Shivam_k大神的英文原创作品 Python | math.factorial() function。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。