Python probability question

List z is as follows

z=[1,2,3,4,5]

You want to see the possibility that the smaller the number, the higher the probability that the number will be drawn.

For example, 1 is 50% Two is 20 percent Three is 15% Four is nine percent 5 is a 6% chance

I'm going to send the selected value to a new list.

I'd appreciate it if you could help me realize the possibility of being chosen with a certain probability