Python's `math.gcd()`

method is a powerful tool that returns the greatest common divisor of two numbers. In simple terms, it allows us to find the the largest integer that can divide both numbers without leaving a remainder.

## Import the Python Math Module

Before we can use the `math.gcd()`

function, we need to import the math module:

```
import math
```

## Basic Function Usage

The `math.gcd()`

function takes two arguments and returns the greatest common divisor of the two numbers.

If either of the numbers is zero, it returns the absolute value of the non-zero number.

The following example demonstrates the basic usage of the `gcd()`

function.

```
import math
print(math.gcd(60, 48))
```

Output:

```
12
```

## Example with Zero

What happens if one of the parameters is set to 0?

```
import math
print(math.gcd(0, 8))
```

Output:

```
8
```

In this case, the function returns the first non-zero number. This is because the greatest common divisor of 0 and any number is the absolute value of that number.

## Working with Negative Numbers

The `math.gcd()`

function also works with negative numbers. It will always return a non-negative result.

```
import math
print(math.gcd(-60, 48))
```

Output:

```
12
```

Similarly, the output is `12`

, because the `gcd`

of negative values is similar to that of their positive equivalents.

## Conclusion

This tutorial has introduced you to Python's `math.gcd()`

function, showing you how to use it to find the greatest common divisor of two numbers. It's a useful function in many different mathematical and practical contexts, and understanding how to use it effectively will be a valuable addition to your Python toolset.