# Lists — Python

Source: https://www.geekswithgeeks.com/en/python/py-lists

> Ordered, mutable sequences — the everyday Python collection.

## Creating & changing

A **list** holds items in order and you can change it after creation — add, remove, or edit elements.

```python
fruits = ["apple", "banana", "cherry"]
fruits.append("date")
fruits.insert(1, "kiwi")
fruits.remove("banana")
print(fruits)
```

Output:

```
['apple', 'kiwi', 'cherry', 'date']
```

## Indexing & slicing

Negative indices count from the end. Slicing `[start:stop:step]` pulls a sub-list without a loop.

```python
nums = [10, 20, 30, 40, 50]
print(nums[-1])      # 50
print(nums[1:4])     # [20, 30, 40]
print(nums[::-1])    # [50, 40, 30, 20, 10]
```

## List methods

Common methods: `sort()`, `reverse()`, `pop()`, `extend()`, `index()`, `count()`. Most mutate the list in place and return `None`.

## sort() vs sorted()

`sorted(nums)` returns a **new** sorted list; `nums.sort()` sorts **in place** and returns `None` — a classic beginner bug.