Subscripting in Python: Accessing Elements within Sequences

In Python, subscripting is the process of accessing a specific element or index within a sequence (such as a list, tuple, or string) using square brackets (`[]`).

For example, if we have a list `my_list` with three elements:
```
my_list = [1, 2, 3]
```
We can access the first element of the list by using the index `0`:
```
print(my_list[0]) # prints 1
```
Similarly, we can access the second element of the list by using the index `1`:
```
print(my_list[1]) # prints 2
```
And we can access the third and final element of the list by using the index `2`:
```
print(my_list[2]) # prints 3
```
We can also use negative indices to access elements from the end of the list. For example, `my_list[-1]` will give us the last element of the list, and `my_list[-2]` will give us the second-to-last element.

It's important to note that subscripting in Python is zero-based, meaning that the first element of a list has an index of 0, not 1. This can be a bit tricky to wrap your head around at first, but it's an important concept to understand when working with lists and other sequences in Python.