The range function specifies a range of integers:
range(start, stop) - the integers between start (inclusive)
        and stop (exclusive)
The third value can be accepted by specifying the change between the values.
range(start, stop, step) - the integers between start (inclusive)
                  and stop (exclusive) by step
For Example you can see below code:
    
for x in range(5, 0, -1):
        print x
    print "Blastoff!"
    Output:
    5
    4
    3 
    2
    1
    Blastoff!
                       
                    
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