>>> list(range(1,10))
[1, 2, 3, 4, 5, 6, 7, 8, 9]



a = range(1, 10) 
for i in a: 
    print i 

for a in range(21,-1,-2):
   print a,

#output(python2)>> 21 19 17 15 13 11 9 7 5 3 1



>>> list(range(0,20,2))
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]

>>> list(range(20,0,-2))
[20, 18, 16, 14, 12, 10, 8, 6, 4, 2]


>>> list(range(10))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]


>>> list(range(-3.5,9.8))
[-3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8]