how to count backwards in for loop python

1    for i in range(len(item)-1, -1, -1):
2        print(item[i])

1# for i in range(start, end, step)
2for i in range(5, 0, -1):
3    print(i)
45
54
63
72
81
9
10    

1for i in range(10, -6, -2):
2    print(i)
3