Python program to print all positive numbers in a range

In this article, we will explore various methods to print all positive numbers in a range. The simplest way to do this is by using a loop. Use a simple for loop to iterate through the given range and check if each number is greater than zero before printing it.

start = -5
end = 3

# Loop through range and print positive numbers
for val in range(start, end + 1):
  
    # checks whether current number is positive
    if val > 0:
        print(val)

1
2
3

Let's explore other different ways to print all positive numbers in a range

Using List comprehension

List comprehension provides a more compact and efficient way to filter numbers. In this method, we will create a list of positive numbers using a list comprehension and then print them.

start = -5
end = 3

# Use list comprehension to filter positive numbers and print them
res = [val for val in range(start, end + 1) if val > 0]
print(res)

[1, 2, 3]

Explanation: [val for val range(start, end + 1) if val > 0] iterates through the range and only includes the numbers that are greater than zero.

Using filter() Function

filter() function allows us to filter elements from an iterable based on a condition. In this case, we will use filter() to get positive numbers in the range and then print them.

start = -5
end = 3

# Use filter to get positive numbers
res = filter(lambda val: val > 0, range(start, end + 1))

# Convert filter object to list and print
print(list(res))

[1, 2, 3]

Explanation:

• filter() function takes two arguments: a function and an iterable. Here, lambda val: val> 0 function checks if a number is positive.
• filter() function returns a filter object which is an iterator, so we convert it to a list using list().