How to express factorial in python

The expression method of factorial in python: first create a function with def code and create a variable res; then write a for range loop, perform calculations in the for loop and return res; finally use the print code to print the output factorial of 3.

The operating environment of this tutorial: Windows 7 system, python version 3.9, DELL G3 computer.

How to express factorial in python:

1. Use def code to create a function with the name func and the parameters n

def func(n):

2. Create a variable res and assign it to the parameter n of the function. The code is as follows:

res = n

3. Then write a for range loop, specifically The code is as follows:

for i in range(1,n):

4. Next, the calculation is performed in the for loop and res is returned. The specific code is as follows:

   res *= i
return res

5. Use the print code to print out the factorial of 3. The code is as follows:

print(func(3))

6. The above code implements the factorial operation. In addition, we can also use recursion. way. The code is as follows:

def func1(n):      
 
   if n==1:
 
       return 1
 
   else:
 
       return n *func1(n-1)
 
print(func1(3))

The recursive method is that the function calls itself

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