Starting from Python 3.6, we can use the _ (underscore) character to separate digits in numeric literals.

In the example below, it is very difficult to tell immediately whether we are dealing with millions or billions.

net_worth = 10000000000

In order to improve readability, we can use an underscore to separate thousands, millions, billions, and so on:

net_worth = 100_00_000000

Now, we can immediately tell that net_worth equals one hundred billion without squinting our eyes to carefully count the zeros.