1. Introduction
In Python, lists are dynamic arrays that can store items of various types. Two common methods for modifying lists are append and extend. The append method adds its argument as a single element to the end of a list, while extend concatenates the first list with another list (or any iterable).
2. Key Points
1. Function: append adds an item to the end of the list, extend adds elements of an iterable to the list.
2. Argument Type: append takes a single element, and extend takes an iterable (like a list, set, or tuple).
3. Result: append increases the list length by one, extend can increase by more than one.
4. Usage: Use append for a single item, and extend for adding multiple items from another iterable.
3. Differences
| Aspect | Append | Extend |
|---|---|---|
| Function | Adds a single element | Adds elements of an iterable |
| Argument Type | Single element | Iterable |
| Result | Increases length by 1 | Can increase the length by more than 1 |
| Usage | For a single item | For adding multiple items |
4. Example
# Example of Append
my_list = [1, 2, 3]
my_list.append(4)
# Example of Extend
another_list = [1, 2, 3]
another_list.extend([4, 5])
Output:
Append Output: [1, 2, 3, 4] Extend Output: [1, 2, 3, 4, 5]
Explanation:
1. With append, 4 is added as a single element, increasing the list length by one.
2. With extend, the elements 4 and 5 from the new list are added, increasing the length by two.
5. When to use?
- Use append when you need to add a single item to the end of the list.
- Use extend when you have multiple items (in the form of another iterable) that you want to add to the list.
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