To get the Factorial of a number in Python using recursion, you have to use function, if statement and recursion login.

**factorial of n is**

`n!=n*(n-1)*....2*1`

A factorial is positive integer **n**, and denoted by **n!**. Then the product of all positive integers is less than or equal to **n**.

**Factorial of 5 is:**

`5! = 1*2*3*4*5 = 120.`

**Example find Factorial of a number in Python using recursion**

Simple example code Factorial of a number using recursion.

```
def foo(n):
if n == 1:
return n
else:
return n * foo(n - 1)
num = 7
# check if the number is negative
if num < 0:
print("Use Positive numbers")
elif num == 0:
print("The factorial of 0 is 1")
else:
print("The factorial of", num, "is", foo(num))
```

**Output**:

**User input value**

```
def foo(n):
if n == 1:
return n
else:
return n * foo(n - 1)
# taking input from the user
number = int(input("User Input : "))
print("The factorial of", number, "is", foo(number))
```

**Output**:

User Input : 5

The factorial of 5 is 120

Do comment if you have any doubts or suggestions on this Python factorial program.

Note:IDE: PyCharm 2021.3 (Community Edition)Windows 10

Python 3.10.1All

Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.

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