This example is to show how to find the greatest common divisor (GCD) of two numbers in Python.

### Source Code

```
#! /usr/bin/env python3
# -*- coding: utf-8 -*-
a = int(input("Enter the first number:"))
b = int(input("Enter the second number:"))
i = a
j = b
gcd1 = 1
while j > 0:
k = j
j = i % j
i = k
else:
gcd1 = i
print("The GCD of the two numbers is ", gcd1)
```

Output:

```
Enter the first number:20
Enter the second number:5
The GCD of the two numbers is 5
Enter the first number:58
Enter the second number:36
The GCD of the two numbers is 2
```