Python: Count negative numbers and sum of positive numbers of a given list

Python Basic - 1: Exercise-84 with Solution

Write a Python program that accepts a list of numbers. Count the negative numbers and compute the sum of the positive numbers of the said list. Return these values through a list.

Sample Solution:

Python Code:

# Define a function to count the number of negative numbers and the sum of positive numbers
def count_sum(nums):
    # Check if the list is empty, and return an empty list if true
    if not nums:
        return []
    
    # Return a list containing the number of negative numbers and the sum of positive numbers
    return [len([n for n in nums if n < 0]), sum(n for n in nums if n > 0)]

# Test cases
nums = [1, 2, 3, 4, 5]
print("Original list:", nums)
print("Number of negative numbers and sum of positive numbers:", count_sum(nums))

nums = [-1, -2, -3, -4, -5]
print("Original list:", nums)
print("Number of negative numbers and sum of positive numbers:", count_sum(nums))

nums = [1, 2, 3, -4, -5]
print("Original list:", nums)
print("Number of negative numbers and sum of positive numbers:", count_sum(nums))

nums = [1, 2, -3, -4, -5]
print("Original list:", nums)
print("Number of negative numbers and sum of positive numbers:", count_sum(nums))

Sample Output:

Original list: [1, 2, 3, 4, 5]
Number of negative of numbers and sum of the positive numbers of the said list: [0, 15]
Original list: [-1, -2, -3, -4, -5]
[5, 0]
Number of negative of numbers and sum of the positive numbers of the said list: [5, 0]
Original list: [1, 2, 3, -4, -5]
[2, 6]
Number of negative of numbers and sum of the positive numbers of the said list: [2, 6]
Original list: [1, 2, -3, -4, -5]
[3, 3]
Number of negative of numbers and sum of the positive numbers of the said list: [3, 3]

Explanation:

Here is a breakdown of the above Python code:

• The function "count_sum()" takes a list of numbers 'nums' as input.
• It checks if the list is empty and returns an empty list if true.
• The function returns a list containing the number of negative numbers and the sum of positive numbers.
• Test cases demonstrate the function's functionality for different input lists.

Visual Presentation:

Flowchart:

Python Code Editor:

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