Python - Number of values greater than K in list

Counting the number of values greater than a specific threshold K in a list is a common programming task. Python provides several efficient approaches to solve this problem using different techniques.

Using a For Loop

The traditional approach uses a counter variable and iterates through each element ?

# Find number of elements > k using for loop
numbers = [1, 7, 5, 6, 3, 8]
k = 4

print("The list:", numbers)

count = 0
for num in numbers:
    if num > k:
        count += 1

print("The numbers greater than 4:", count)

The list: [1, 7, 5, 6, 3, 8]
The numbers greater than 4: 4

Using List Comprehension

List comprehension provides a more concise and Pythonic solution ?

# Find number of elements > k using list comprehension
numbers = [1, 7, 5, 6, 3, 8]
k = 4

print("The list:", numbers)

count = len([num for num in numbers if num > k])

print("The numbers greater than 4:", count)

The list: [1, 7, 5, 6, 3, 8]
The numbers greater than 4: 4

Using sum() with Generator Expression

The most memory-efficient approach uses sum() with a generator expression that treats True as 1 and False as 0 ?

# Find number of elements > k using sum()
numbers = [1, 7, 5, 6, 3, 8]
k = 4

print("The list:", numbers)

count = sum(num > k for num in numbers)

print("The numbers greater than 4:", count)

The list: [1, 7, 5, 6, 3, 8]
The numbers greater than 4: 4

Comparison

Conclusion

Use sum() with generator expression for the most efficient solution. For beginners, the for loop approach is easier to understand and debug.