how to add variables to a list code example

Example 1: add an element to list python

a=[8,5,6,1,7]
a.append(9)

Example 2: how to add a variable in list

print('Hee')

Example 3: how to append variable python

volumeA = 100
volumeB = 20
volumeC = 10

vol = []

vol.append(volume*)