for i in range(5):
    print(i)

range(5, 10)
5, 6, 7, 8, 9

range(0, 10, 3)
0, 3, 6, 9

range(-10, -100, -30)
-10, -40, -70

a = ['Mary', 'had', 'a', 'little', 'lamb']
for i in range(len(a)):
    print(i, a[i])

print(range(10))

sum(range(4))  # 0+1+2+3

list(range(4))
