You know lists — flexible, changeable, great for collections you build up over time.
But some data should **never change**. GPS coordinates. RGB colour values. Database row IDs. Days of the week.
For that, Python has tuples. A tuple is like a list, but once you create it, it's locked forever.
Use parentheses instead of square brackets:
point = (10, 20) instead of point = [10, 20]
Run this.