Python Learning Series · @onlysamarrr · Day 13 / 30

Day 13: List Methods

Day 13 covers list methods. append() adds to the end, insert() adds at a position, remove() deletes by value, pop() takes out the last item, and sort() changes the list itself and returns None.

Phase: Beginner · Reels: 61/450 – 65/450

Quick Answer

Day 13 covers list methods. append() adds to the end, insert() adds at a position, remove() deletes by value, pop() takes out the last item, and sort() changes the list itself and returns None.

What You Will Learn

append(40) adds 40 at the end of the list.
insert(0, 5) puts 5 at index 0 and shifts the rest forward.
remove(20) deletes the first item with value 20.
pop() removes and returns the last item.
extend([1, 2]) adds two items; append([1, 2]) would add one list as a single item.
sort() sorts the list in place and returns None, so nums = nums.sort() makes nums None.

Code

nums = [10, 20, 30]
nums.append(40)
nums.insert(0, 5)
nums.remove(20)
last = nums.pop()
print(nums, "popped:", last)
nums.extend([1, 2])
print(nums)
nums.sort()
print(nums)
print(list(dict.fromkeys([3, 1, 3, 2])))

Output

[5, 10, 30] popped: 40
[5, 10, 30, 1, 2]
[1, 2, 5, 10, 30]
[3, 1, 2]

Code Explained, Line by Line

append(40) adds 40 at the end of the list.
insert(0, 5) puts 5 at index 0 and shifts the rest forward.
remove(20) deletes the first item with value 20.
pop() removes and returns the last item.
extend([1, 2]) adds two items; append([1, 2]) would add one list as a single item.
sort() sorts the list in place and returns None, so nums = nums.sort() makes nums None.

Common Mistake: nums = nums.sort() is a classic bug: sort() returns None and changes the list itself. Just call nums.sort().

Real-Life Use

Removing duplicates, sorting scores and managing carts all use these list methods.

Practice Task: Remove duplicates from a list and show the difference between append and extend with a small example.

Test Yourself — MCQs

Select (tick) an option, then tap Check answer to see instantly whether your answer is right or wrong, with an explanation. You can change your answer and check again.

Q1. What does [1, 2].append([3, 4]) give?

A. [1, 2, 3, 4] B. [1, 2, [3, 4]] C. [3, 4] D. Error

Q2. What does sort() return?

A. The sorted list B. None C. The first item D. A copy

Q3. What does pop() return?

A. The first item B. The last item C. The list length D. None

Today's 5 Reels (from the 90-Day Plan Excel)

61/450	Concept	append, insert, remove
62/450	Live demo	pop, sort, reverse demo
63/450	Common mistake	sort() None return karta
64/450	Quiz	Quiz: list se duplicates
65/450	Interview / real life	Interview: append vs extend

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