Python Coding challenge - Day 1161| What is the output of the following Python Code?

 

Code Explanation:

🔹 1. Creating the List

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

✅ Explanation:

A list named nums is created.

It contains:

[1, 2, 3, 4, 5]

🔹 2. Using filter()

result = filter(

✅ Explanation:

filter() is a built-in Python function.

It filters elements based on a condition.

Syntax:

filter(function, iterable)

function → returns True or False

iterable → list, tuple, etc.

🔹 3. Lambda Function

lambda x: x % 2 == 0

✅ Explanation:

This is an anonymous function.

Equivalent code:

def check(x):

    return x % 2 == 0

Condition:

x % 2 == 0

Checks whether a number is even.

🔹 4. Passing the List

nums

✅ Explanation:

The lambda function will be applied to each element of:

[1, 2, 3, 4, 5]

🔹 5. Internal Working of filter()

Python checks every element one by one.

🔍 For 1

1 % 2 == 0

Result:

False

❌ Rejected

🔍 For 2

2 % 2 == 0

Result:

True

✅ Kept

🔍 For 3

3 % 2 == 0

Result:

False

❌ Rejected

🔍 For 4

4 % 2 == 0

Result:

True

✅ Kept

🔍 For 5

5 % 2 == 0

Result:

False

❌ Rejected

🔹 6. Result After Filtering

Remaining values:

2

4

So internally:

filter object → [2, 4]

🔹 7. Converting to List

print(list(result))

✅ Explanation:

filter() returns a filter object (iterator).

list() converts it into a list.

Result:

[2, 4]

🎯 Final Output

[2, 4]

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