PYTHON : Why is Python 3 not backwards compatible?

PYTHON : Why is Python 3 not backwards compatible?
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

Here's a secret feature that I promised to disclose to you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Next, enter the letters 'awesome' on your keyboard.
Your YouTube progress indicator will turn into a shimmering rainbow.

A little intro about me,
Hello, I am Delphi.
I can assist you in discovering answers to your inquiries.
PYTHON : Why is Python 3 not backwards compatible?
If you have more specific query you can comment or chat with me and let me know your queries.
Your input is appreciated, so please leave a comment below with your answer or insights to the answer.
I will express my appreciation for your answer by 'hearting' it.
compatible? Why : 3 not backwards Python is PYTHON