Python range issue

Question

I am writing a program in which it needs to determine the range of the number as if I put 15 in user_input 'a' so it should print range from 'a' to 'b' but unfortunately i'm unable to work it out can anyone please help me with this. This is my code:

a = int(raw_input("How many did you say you're going to count down? "))
b = int(raw_input("When are you actually going to stop? "))
i = 0
for i in range(a, b):
    i = i + 1
    print i

and I want it to work like this:

How many did you say you're going to count down? 15
When are you actually going to stop? 8
15
14
13
12
11
10
9
8

OR

How many did you say you're going to count down? 6
When are you actually going to stop? 4
6
5
4

Eric O. Lebigot · Accepted Answer · 2012-09-01 08:53:51Z

5

The loop can be:

a = int(raw_input("How many did you say you're going to count down? "))
b = int(raw_input("When are you actually going to stop? "))

for i in range(a, b-1, -1):
    print i

(assuming the count decreases).

What you must know is:

The for loop does the decrement for you (no need for i = i-1 like in C).
range(a, b-1, -1) is a list (in Python 2) that goes from a to b-1 (not included), by steps of -1. You can try to do, in a Python shell, print range(10, 5, -1), for instance. You can also check the output of range(5, 11, 2), to understand better what range() does.

edited Sep 1, 2012 at 8:53

answered Sep 1, 2012 at 8:48

Eric O. Lebigot

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1 Comment

Tim Pietzcker Over a year ago

@rocker789: Now it does. Your loop was counting upwards (twice).

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