How to use python factorial function

There are two factorial functions in python, and those created by yourself are not counted.

The first is the factorial function in the numpy library (recommended learning: Python video tutorial)

improt numpy
print numpy.math.factorial(3)

Second, the standard library that comes with python also has the factorial function

import math
print math.factorial(3)

Example:

#由于第一种需要下载库，我们使用第二种
import math
value = math.factorial(3)    
print(value)

Output:

6

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