Python List

Python List

In Python, a list is a built-in data structure that allows you to store and manipulate a collection of items. Lists are ordered, mutable (modifiable), and can contain elements of different data types. You can think of a list as a sequence of values enclosed in square brackets [ ], with each value separated by a comma.

Here’s an example of a Python list:

python
my_list = [1, 2, 3, 'four', 5.0]

In this example, my_list contains five elements: an integer (1), another integer (2), a third integer (3), a string ('four'), and a float (5.0).

You can access individual elements of a list by their index. Python uses zero-based indexing, so the first element is at index 0, the second element at index 1, and so on. For example, to access the third element in my_list, you would use my_list[2].

Lists in Python are mutable, meaning you can modify their contents. You can change the value of an element by assigning a new value to a specific index. For example, my_list[0] = 10 would change the first element of my_list to 10.

You can perform various operations on lists, such as adding elements, removing elements, slicing, concatenating, sorting, and more. Python provides a rich set of built-in methods and functions to manipulate lists.

Here are a few examples of common list operations:

python
my_list = [1, 2, 3, 4, 5]

# Append an element to the end of the list
my_list.append(6)  # my_list is now [1, 2, 3, 4, 5, 6]

# Remove an element from the list
my_list.remove(3)  # my_list is now [1, 2, 4, 5, 6]

# Get the length of the list
length = len(my_list)  # length is 5

# Access a sublist (slice) of the list
sublist = my_list[1:4]  # sublist is [2, 4, 5]

# Concatenate two lists
other_list = [7, 8, 9]
concatenated = my_list + other_list  # concatenated is [1, 2, 4, 5, 6, 7, 8, 9]

# Sort the list
my_list.sort()  # my_list is now [1, 2, 4, 5, 6]

These are just a few examples of what you can do with lists in Python. Lists are versatile and widely used in Python programs to store and manipulate collections of data.

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