🚀 Day 46/150 – Sum of List Elements in Python

 

Finding the sum of elements in a list is a common operation used in many programs.

Example:
[1, 2, 3, 4, 5] → Sum = 15

Let’s explore different ways to calculate the sum 👇

🔹 Method 1 – Using sum() Function

numbers = [1, 2, 3, 4, 5] print("Sum:", sum(numbers))

✅ Easiest and most recommended method.

🔹 Method 2 – Using for Loop

numbers = [1, 2, 3, 4, 5] total = 0 for num in numbers: total += num print("Sum:", total)

✅ Good for understanding logic.

🔹 Method 3 – Taking User Input

numbers = list(map(int, input("Enter numbers: ").split()))

print("Sum:", sum(numbers))

✅ Dynamic input from user.

🔹 Method 4 – Using while Loop
numbers = [1, 2, 3, 4, 5]

i = 0
total = 0

while i < len(numbers):
    total += numbers[i]
    i += 1

print("Sum:", total)




✅ Alternative looping method.
🔹 Method 5 – Using functools.reduce()
from functools import reduce

numbers = [1, 2, 3, 4, 5]

total = reduce(lambda x, y: x + y, numbers)

print("Sum:", total)




✅ Functional programming approach.
🔹 Output
Sum: 15

🔥 Key Takeaways

✔️ sum() is the simplest and fastest

✔️ Loops help build understanding

✔️ reduce() is useful for functional style

✔️ Handle empty lists in real-world use