i still dont know how 'sort' work with 'key=takeSecond'. Plz mind blowing me !!!

Question

# take second element for sort
def takeSecond(elem):
return elem[1]

# random list
random = [(2, 2), (3, 4), (4, 1), (1, 3)]

# sort list with key
random.sort(key=takeSecond)

# print list
print('Sorted list:', random)