Python – Calculate the percentage of positive elements of the list

When calculating the percentage of positive elements in a list, we can use list comprehension along with the len() method to count positive values and compute the percentage.

Example

Here's how to calculate the percentage of positive elements in a list ?

my_list = [14, 62, -22, 13, -87, 0, -21, 81, 29, 31]

print("The list is :")
print(my_list)

my_result = (len([element for element in my_list if element > 0]) / len(my_list)) * 100

print("The result is :")
print(my_result)

Output

The list is :
[14, 62, -22, 13, -87, 0, -21, 81, 29, 31]
The result is :
60.0

How It Works

• A list containing positive, negative, and zero values is defined

• List comprehension [element for element in my_list if element > 0] filters only positive elements

• The length of positive elements is divided by the total length and multiplied by 100 to get percentage

• In this example, 6 out of 10 elements are positive, giving us 60.0%

Alternative Method Using sum()

You can also use sum() with a generator expression for a more memory-efficient approach ?

my_list = [14, 62, -22, 13, -87, 0, -21, 81, 29, 31]

positive_percentage = (sum(1 for element in my_list if element > 0) / len(my_list)) * 100

print("The list is :")
print(my_list)
print("Percentage of positive elements:", positive_percentage)

The list is :
[14, 62, -22, 13, -87, 0, -21, 81, 29, 31]
Percentage of positive elements: 60.0

Conclusion

Use list comprehension with len() to calculate percentage of positive elements. The sum() method with generator expression is more memory-efficient for large lists.