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Python | Program to print numbers from N to 1 (use range() with reverse order)

Here, we will learn how to print numbers in reverse order i.e. how to use range() method in reverse order/ decreasing steps.
Submitted by IncludeHelp, on July 29, 2018

Problem statement

Given the value of N and we have to print numbers from N to 1 in Python.

Iterate a range values

To iterate a range values, the range() method is used. Simply, you can use range(start, stop)

Let's understand by an example, if we want to iterate any loop till a to b, then range statement will be range(a, b+1).

Iterate a range values in reverse order

To iterate range in reverse order, we use 3 parameters

1. Start – start value
2. Stop – end value
3. Step – Increment/Decrement to the value

Examples

1) To print numbers from B to A

for i in range(B, A-1, -1)
	print i

2) To print numbers from B to A by escaping one number between

for i in range(B, A-1, -2)
	print i

Python program to print numbers from N to 1

# Python program to print numbers
# from n to 1

# input the value of n
n = int(input("Enter the value of n: "))

# check the input value
if n <= 1:
    print("n should be greater than 1")
    exit()

# print the value of n
print("value of n: ", n)

# print the numbers from n to 1
# message
print("numbers from {0} to {1} are: ".format(n, 1))

# loop to print numbers
for i in range(n, 0, -1):
    print(i)

Output 1

Enter the value of n: 10
value of n:  10
numbers from 10 to 1 are: 
10
9
8
7
6
5
4
3
2
1

Output 2

When the value of n is 1

Enter the value of n: 1
n should be greater than 1

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