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01. Create a list of integers from 1 to nE02. Access elements by positive and negative indexE03. Slice a list to get first and last three itemsE04. Append an item and extend a listE05. Insert and remove elements in a listE06. Find element index or return -1E07. Count occurrences of a value in a listE08. Reverse a list in-place and by slicingE09. Sort a list of numbers ascending and descendingE10. Convert between lists and tuplesE11. Interleave two lists element by elementM12. Flatten a single-level list of listsM13. Filter a list using a predicateM14. Map a function over a listM15. Rotate a list by k positionsM16. Get unique elements preserving orderM17. Partition a list by a conditionM18. Replace a sublist slice with another listM19. Group equal consecutive values into sublistsH20. Reconstruct a list from value-count tuplesH

Problem No 4

Append an item and extend a list

Easy

≈ 6 minute session

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Summary

Learn how to add a single item to a list and then extend it with another iterable, returning the modified list.

Problem statement

Write a function append_and_extend(lst, item, to_extend) that appends item to the end of lst and then extends lst with all elements from to_extend (an iterable). The function should modify the provided list and return it. Handle any iterable for to_extend (e.g., list, tuple, range). Do not create and return a new list — modify the original and return it.

Task

Implement a function that appends one element to a list and extends it with another iterable, returning the modified list.

Examples

Append and extend a list

Input

append_and_extend([1, 2], 3, [4, 5])

Output

[1, 2, 3, 4, 5]

Explanation

First append 3 to [1, 2] -> [1, 2, 3], then extend with [4, 5] -> [1, 2, 3, 4, 5].

Input format

A function call: append_and_extend(lst, item, to_extend)

Output format

Return the modified list (the same object after changes).

Constraints

Do not create a new list; perform operations in-place (use append and extend semantics). to_extend can be any iterable.

Samples

Sample input 0

append_and_extend([], 'a', [])

Sample output 0

['a']

Explanation 0

Appending 'a' to an empty list and extending with an empty iterable results in ['a'].

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