Printing numbers backward is a common task in programming, especially when you need to reverse the order of a list or display numbers in a specific sequence. In this tutorial, we will learn how to print numbers backward in Python using various methods such as for loops and list comprehensions.

Method 1: Using a for loop

One of the simplest ways to print numbers backward in Python is to use a for loop. To do this, we will utilize the range() function, which allows us to generate a sequence of numbers by specifying the start, end, and step values.

Here’s an example of how you can use a for loop to print numbers backward:

In this case, we set the start value to 10, the end value to 0, and the step value to -1. The for loop will generate numbers starting at 10 and decrementing by 1 until it reaches 0.

Method 2: Using a list comprehension

Another method to print numbers backward in Python is to use list comprehension. List comprehensions provide a concise way to create lists based on existing lists or other iterable objects.

Here’s how you can use list comprehension to generate a list of numbers and then print them backward:

In this example, we first create a list of numbers using a list comprehension and the range() function. Then, we use the reversed() function to generate an iterator that returns the elements of the list in reverse order. Finally, we use a for loop to print each number in the reversed sequence.

Full Code Example:

Output:

10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1

In conclusion, we have seen two different methods to print numbers backward in Python: using a for loop with the range() function and using a list comprehension with the reversed() function. Both methods are easy to implement and can be tailored to suit your specific requirements depending on the desired output.