 Hi everyone, in this lesson we are going to talk about how to find factorial of some number in Python programming language. In order to find factorial of any number using Python programming language, you need to call function factorial and put inside it as an argument a number for which you want to find factorial. But if you try to do that, you will get an error because name factorial is not defined. And that's because function factorial is into mat module. So first we need to import mat module and that we need to call function factorial. So we'll say mat dot factorial of let's say 4. And we'll get that factorial of number 4 is 24. That's all in this video, thanks for watching.