
# Overview
In Python, **`itertools`** is a module in Python that provides functions. These functions help in iterating through iterables.

The `product()` method of the `itertools` module returns the cartesian product of the input iterables. The method takes an optional argument called `repeat`, which when used returns the cartesian product of the iterable with itself for the number of times specified in the `repeat` parameter.

Let's refer to the coding example below to understand more.

# 
## Syntax

```python
itertools.product(*iterables, repeat=1)
```

## Parameters

- `*iterables`: The list of iterables.
- `repeat`: An integer argument that returns the cartesian product of the iterable with itself for the number of times specified.

## Example

from itertools import product

lst = [1,2,3,4,5]
print("Original list - ", lst)
print("Cartesian product of the list with itself - ", list(product(lst, repeat=2)))

lst1 = [1, 2, 3]
lst2 = ['a', 'b', 'c']
print("Cartesian product of the lst1 and lst2 - ", list(product(lst1, lst2)))


## Explanation

- Line 1: We import the `product` function from `itertools` module.
- Line 3: We define list of numbers called `lst`.
- Line 4: We print the list, `lst`.
- Line 5: We invoke the `product` function with `lst` and `repeat=2` as arguments to obtain the cartesian product of `lst` with itself.
- Line 7: We define a list of numbers, `lst11`.
- Line 8: We define a list of characters, `lst2`.
- Line 9: We invoke the `product` function with `lst1` and `lst2` as arguments to obtain the cartesian product between `lst1` and `lst2`.


What is the itertools.product() method in Python?

It returns the cartesian product of input iterables and supports a repeat argument for self-cartesian products.