What is a list () in Python With Example

In Python, list() is a built-in function used to create a new list. The list() function can take an iterable (like a string, tuple, dictionary, etc.) as an argument and convert it into a new list.

Here are some examples of using the list() function:

1. Converting a string to a list of characters:

text = "Hello, World!"
char_list = list(text)
print(char_list)  # Output: ['H', 'e', 'l', 'l', 'o', ',', ' ', 'W', 'o', 'r', 'l', 'd', '!']

2. Converting a tuple to a list:

tuple_data = (1, 2, 3, 4, 5)
list_data = list(tuple_data)
print(list_data)  # Output: [1, 2, 3, 4, 5]

3. Converting a range object to a list:

range_obj = range(1, 6)
list_range = list(range_obj)
print(list_range)  # Output: [1, 2, 3, 4, 5]

4. Converting a dictionary’s keys or values to a list:

data_dict = {'a': 1, 'b': 2, 'c': 3}
keys_list = list(data_dict.keys())
values_list = list(data_dict.values())
print(keys_list)  # Output: ['a', 'b', 'c']
print(values_list)  # Output: [1, 2, 3]

5. Creating an empty list:

empty_list = list()
print(empty_list)  # Output: []

The list() function is useful for converting other iterable data types into lists, which allows you to take advantage of the list-specific functionalities like indexing, appending, and more.

What are the examples of list in Python?

In Python, lists are used to store collections of items. They are versatile and can contain elements of different data types. Here are some examples of lists in Python:

1. List of numbers:

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

2. List of strings:

fruits = ["apple", "banana", "orange", "grape"]

3. List of mixed data types:

mixed_list = [1, "hello", 3.14, True]

4. Nested lists (list of lists):

matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

5. List of boolean values:

flags = [True, False, True, True, False]

6. List of characters:

characters = ['a', 'b', 'c', 'd']

7. List of lists (2D list):

data = [['Alice', 25], ['Bob', 30], ['Carol', 22]]

8. Empty list:

empty_list = []

Lists are mutable, meaning you can modify, add, or remove elements after creation.

To access individual elements within a list, you can use indexing, like list_name[index].

For example, fruits[0] would give you “apple” from the fruits list.

Lists also support various methods for operations like adding elements (e.g., append(), extend(), insert()), removing elements (e.g., remove(), pop()), and sorting (e.g., sort()).

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