List

A list is an ordered collection of items or elements. It is a fundamental data structure in programming and is widely used in various applications. In a list, each element has a specific position or index, starting from 0 for the first element, 1 for the second element, and so on. Lists can contain elements of different types, such as numbers, strings, or even other lists.

Creating a List
To create a list, we enclose the elements in square brackets and separate them with commas. Here's an example of a list of numbers:

```
numbers = [1, 2, 3, 4, 5]
```

Accessing List Elements
We can access individual elements in a list using their index. To do this, we use square brackets and provide the index of the element we want to access. For example:

```
fruits = ['apple', 'banana', 'orange', 'grape']
print(fruits[0]) # Output: 'apple'
print(fruits[2]) # Output: 'orange'
```

Modifying List Elements
Lists are mutable, which means we can change the values of their elements. We can assign a new value to a specific index to modify an element. For example:

```
numbers = [1, 2, 3, 4, 5]
numbers[2] = 10
print(numbers) # Output: [1, 2, 10, 4, 5]
```

List Operations
Lists support various operations, including appending elements, removing elements, and concatenating lists.

- Appending Elements: We can add new elements to the end of a list using the `append()` method. For example:

```
fruits = ['apple', 'banana', 'orange']
fruits.append('grape')
print(fruits) # Output: ['apple', 'banana', 'orange', 'grape']
```

- Removing Elements: We can remove elements from a list using the `remove()` method by specifying the element we want to remove. For example:

```
fruits = ['apple', 'banana', 'orange', 'grape']
fruits.remove('banana')
print(fruits) # Output: ['apple', 'orange', 'grape']
```

- Concatenating Lists: We can combine two or more lists using the `+` operator. This operation creates a new list that contains all the elements from the original lists. For example:

```
list1 = [1, 2, 3]
list2 = [4, 5, 6]
combined_list = list1 + list2
print(combined_list) # Output: [1, 2, 3, 4, 5, 6]
```

List Functions and Methods
There are several built-in functions and methods available for manipulating lists. Some commonly used ones include:

- len(): Returns the number of elements in a list.
- sort(): Sorts the elements of a list in ascending order.
- reverse(): Reverses the order of elements in a list.
- count():