Python: How to countdown a number, and append that countdown to a list

Question

Here's my attempt at creating a countdown in which all the numbers get appended to a list.

timeleft = 3
num1 = 24 - timeleft
mylist = []


def countdown():
    while num1 != 0:
          num1 -= 1
          mylist.append(num1)

countdown()

This is a small section of a schedule making app I'm making.

Answer 1

Instead of using global variables, I'd write a countdown function which accepts a start parameter and returns a list like this:

def countdown(start):
    return list(range(start,0,-1))

Demo:

timeleft = 3
num1 = 24 - timeleft
cd = countdown(num1)
print(cd) # [21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1]

If you want to count to zero use range(start,-1,-1).