Python Coding Challenge - Question with Answer (ID -200326)

 

Explanation:

🔹 1. List Creation

nums = [None, 0, False, 1, 2]

A list named nums is created.

It contains different types of values:

None → represents no value

0 → integer zero

False → boolean false

1, 2 → positive integers

👉 In Python:

None, 0, False are falsy values

1, 2 are truthy values

🔹 2. Using filter() Function

res = list(filter(bool, nums))

filter(function, iterable) applies a function to each item.

Only elements where the function returns True are kept.

👉 Here:

bool is used as the function.

Each element is checked like this:

bool(value)

🔹 3. Filtering Process (Step-by-Step)

Element bool(value) Result

None  False     ❌ Removed

0         False     ❌ Removed

False False     ❌ Removed

1         True             ✅ Kept

2         True             ✅ Kept

👉 After filtering:

[1, 2]

🔹 4. Converting to List

filter() returns a filter object (iterator).

list() converts it into a proper list.

🔹 5. Printing Output

print(res)

Displays the final filtered list.

✅ Final Output

[1, 2]

BOOK: 100 Python Challenges to Think Like a Developer