Print Numbers in an Interval - Python

In this article, we are going to learn how to print numbers within a given interval in Python using simple loops, list comprehensions, and step-based ranges.

For Example:

Input : i = 2, j = 5
Output : 2 3 4 5

Input : i = 10, j = 20 , s = 2
Output : 10 12 14 16 18 20

Let’s explore different methods to print numbers between two values in Python.

Print All Numbers Between Two Values

The simplest way to print numbers in an interval is by using a for loop with the range() function.

i = 10
j = 20

for num in range(i, j + 1):
    print(num)

10
11
12
13
14
15
16
17
18
19
20

Explanation:

• range(i, j + 1) includes the upper limit by adding +1.
• loop prints each number from i to j one by one.

Print Only Even Numbers in an Interval

You can modify the step of the range() function to skip numbers, such as printing only even numbers.

i = 10
j = 20

if i % 2 == 0:
    for num in range(i, j + 1, 2):
        print(num)
else:
    for num in range(i + 1, j + 1, 2):
        print(num)

10
12
14
16
18
20

Explanation:

• code ensures that the loop starts with the first even number in the interval.
• range(..., ..., 2) increases the count by 2 to skip odd numbers.

Generate Numbers Using List Comprehension

List comprehensions offer a short and elegant way to generate a list of numbers within a given range.

i = 10
j = 20
a = [num for num in range(i, j + 1)]
print(a)

[10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]

Explanation:

• [num for num in range(l, u + 1)] builds a list of numbers from l to u.
• final result is printed as a list.

For in-depth knowledge of the methods used in this article, read: for-loops, list comprehension, range(), Python.