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Lesson 17: Adding, Removing and Changing List Items (Teach This Topic)

August 8, 2026 by Lenara Learning

This guide supports teaching how Python lists can be changed after they are created. Open Full Article...

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Lesson 17: Adding, Removing and Changing List Items

Categories Teach This Topic Tags `"yellow"` and `"green"`. The item at index 1 has been replaced., `append(value)` adds one value to the end of a list., `clear()` removes all items from the list, `extend(iterable)` adds each item from another iterable to the end of the list. Keep examples based on another list:, `insert(index, `pop(index)` removes and returns the item at the supplied position. If no index is supplied, `remove(value)` removes the first list item whose value is equal to the supplied value. If the value does not exist, "blue", "green"], "orange"), “How can a Python program add, 2], 3 and 4., 4]` as one item. `extend([3, 4]), 4])` adds 3 and 4 as separate items., 4])` adds the entire list `[3, a = [1, a.extend([3, adds `"purple"` as one new item at the end., After the assignment, An individual item can be replaced using its index. For example:, before-and-after diagrams, but explain every concept in language suitable for beginners nearer age 11., but keep these wider uses secondary., Clearly distinguish append() and extend(). `append([3, coding exercises, colours = ["red", colours.append("purple"), colours.insert(1, colours[1] = "yellow", comprehensions or advanced list manipulation. Keep the lesson focused on straightforward modification of one-dimensional lists., copying and aliasing, del colours[1], demonstrations or other hands-on work. Do not tell learners to type, Do not introduce complicated slicing assignments, edit, Explain that indexes can change after an item is inserted or removed. If the first item is removed, extend(), For example:, index tables, indexed and read from Lesson 16. Keep the information technically accurate and substantial, insert(), inserting at index 0 places an item at the beginning, inserts `"orange"` before the item previously at index 1., it raises ValueError., leaving the existing list empty., Make the difference between value and position very clear. `remove("blue")` searches for the value `"blue"`. `pop(1)` uses the numerical index 1. These operations are not interchangeable., nested lists, pop() and clear() as standard list methods. append() adds one item to the end, pop() removes and returns the final item. Trying to pop from an empty list or using an invalid index raises IndexError., practical tasks, prediction questions and fictional program behaviour are suitable., produces a list containing 1, Python lists are mutable. This means the contents of an existing list can be changed after the list has been created., Python's official tutorial documents append(), remove or replace information inside a list?”, remove(), removes the item currently at index 1. `del` can also remove slices or delete a variable name completely, save or run code. Written examples, software activities, Teach the main removal operations accurately., Teach the main ways of adding items clearly., terminal exercises, The `del` statement can remove an item using its index. For example:, the item that was at index 1 normally moves to index 0. Learners should therefore think of an index as the current position of an item rather than a permanent number belonging to it., The lesson must contain no practical assessments, the list contains `"red"`, The official documentation confirms that insert() places an item at a specified position. For example, This is Lesson 17 of a beginner Python course. Assume learners understand how lists are created, Use the central enquiry:, value)` inserts one item before the specified index. Existing items at that position and after it move along., Verified facts from the checked official Python 3.14.6 documentation:, while extend() adds all items from an iterable. :contentReference[oaicite:0]{index=0}, while inserting at len(a) has an effect equivalent to appending the item. :contentReference[oaicite:1]{index=1}

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