Python Program to Print all Positive Numbers in a Range

Given two integers, start and end, the task is to print all positive numbers between the given range, including both endpoints. For Examples:

Input: start = -5, end = 3
Output: [1, 2, 3]

Below are the different methods to solve this problem:

Using List comprehension

List comprehension iterates over the range, selects numbers greater than zero, and stores them in a list.

a = -5
b = 3
res = [i for i in range(a, b + 1) if i > 0]
print(res)

[1, 2, 3]

Explanation:

• range(a, b + 1): generates numbers from start to end (inclusive).
• if i > 0: keeps only positive numbers.
• The result is a list of all positive values in the given range.

Using filter() Function

The filter() function applies a condition to each element of the range. It returns only elements that satisfy the condition.

a = -5
b = 3
res = filter(lambda val: val > 0, range(a, b + 1))
print(list(res))

[1, 2, 3]

Explanation:

• lambda val: val > 0: defines a function that returns True for positive numbers.
• filter(): selects only those numbers.
• list(): converts the filter object into a list for display.

Using for Loop

This approach uses a simple loop to check each number in the given range and print it if it’s positive.

a = -5
b = 3

for i in range(a, b + 1):
    if i > 0:
        print(i, end=" ")

1 2 3 

Explanation: Iterates from start to end, prints the number only if it’s greater than zero.

Using while Loop

A while loop can also be used to iterate manually from start to end and print positive numbers.

a = -5
b = 3

while a <= b:
    if a > 0:
        print(a, end=" ")
    a += 1

1 2 3 

Explanation: Increments start in each step, printing only positive numbers until the range ends.

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