🚀 Day 48/150 – Count Even and Odd Numbers in a List in Python

Counting even and odd numbers in a list helps you practice loops, conditions, and list handling.

 Even numbers are divisible by 2
 Odd numbers are not divisible by 2

Example:
[1, 2, 3, 4, 5] → Even = 2, Odd = 3

Let’s explore different ways 👇

🔹 Method 1 – Using for Loop

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

even = 0
odd = 0

for num in numbers:
    if num % 2 == 0:
        even += 1
    else:
        odd += 1

print("Even:", even)
print("Odd:", odd)






✅ Most common method.

🔹 Method 2 – Taking User Input

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

even = odd = 0

for num in numbers:
    if num % 2 == 0:
        even += 1
    else:
        odd += 1

print("Even:", even)
print("Odd:", odd)






✅ Dynamic input.

🔹 Method 3 – Using List Comprehension

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

even = len([num for num in numbers if num % 2 == 0])
odd = len([num for num in numbers if num % 2 != 0])

print("Even:", even)
print("Odd:", odd)

✅ Clean and Pythonic.

🔹 Method 4 – Using while Loop

numbers = [1, 2, 3, 4, 5] i = 0 even = odd = 0 while i < len(numbers): if numbers[i] % 2 == 0: even += 1 else: odd += 1 i += 1 print("Even:", even) print("Odd:", odd)

✅ Loop practice.

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🚀 Day 47/150 – Average of List Elements in Python

 

Finding the average (mean) of a list means adding all elements and dividing by the total number of elements.

Formula:
Average = Sum of elements / Number of elements

Example:
[2, 4, 6, 8] → Average = (2+4+6+8)/4 = 5.0

Let’s explore different ways to calculate average 👇

🔹 Method 1 – Using sum() and len()

✅ Easiest and most recommended method.

numbers = [2, 4, 6, 8] avg = sum(numbers) / len(numbers) print("Average:", avg)

✅ Easiest and most recommended method.

🔹 Method 2 – Using for Loop

numbers = [2, 4, 6, 8]

total = 0

for num in numbers:
    total += num

avg = total / len(numbers)

print("Average:", avg)











✅ Good for understanding logic.

🔹 Method 3 – Taking User Input
numbers = list(map(int, input("Enter numbers: ").split()))

avg = sum(numbers) / len(numbers)

print("Average:", avg)





✅ Dynamic input from user.

🔹 Method 4 – Using while Loop
numbers = [2, 4, 6, 8]

i = 0
total = 0

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

avg = total / len(numbers)

print("Average:", avg)







✅ Alternative looping method.


🔹 Method 5 – Using Function
def average(lst):
    return sum(lst) / len(lst)

print(average([2, 4, 6, 8]))



✅ Clean and reusable.

🔹 Output
Average: 5.0

🔥 Key Takeaways
✔️ Use sum() and len() for simplicity

✔️ Average = total / count

✔️ Loops help build logic

✔️ Handle empty list to avoid division error

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🚀 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

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