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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

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

range() Method

This method is used to iterate a range values.

Simply, we 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 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

Program to print numbers from N to 1 in Python

# 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