浅谈python内置变量-reversed(seq)

def fun3():
  x = [3,6,9]
  for i in reversed(x):
  print(i,end=',')
fun3()

> a = range(5)
> a
range(0, 5)
> list(a)
[0, 1, 2, 3, 4]
> a1 = reversed(a)
> list(a1)
[4, 3, 2, 1, 0]