# Create an empty list using square brackets.numbers = []print(numbers) # Output: []# Create an empty list using list().numbers = list()print(numbers) # Output: []# Create a list of numbers.numbers = [1, 2, 3]print(numbers) # Output: [1, 2, 3]# Create a list of numbers in a range.numbers = list(range(1, 4))print(numbers) # Output: [1, 2, 3]# Create a list of tuples.tuples_list = [(1, 2), (2, 4), (3, 6)]print(tuples_list) # Output: [(1, 2), (2, 4), (3, 6)]

# Create a list of lists.list_of_lists = [[1, 2], [2, 4], [3, 6]]print(list_of_lists) # Output: [[1, 2], [2, 4], [3, 6]]# Create a list with items of different data types.random_list = [1, "hey", [1, 2]]print(random_list) # Output: [1, "hey", [1, 2]]# Get length of list by using len() method.numbers = [5, 8, 8]print(len(numbers)) # Output: 3# Access elements of a list by indexing.str_list = ["hey", "there!", "how", "are", "you?"]print(str_list[0]) # Output: "hey"print(str_list[len(str_list) - 1]) # Output: "you?"print(str_list[-1]) # Output: "you?"

# Slicing a list.str_list = ["hey", "there!", "how", "are", "you?"]print(str_list[2:]) # Output: ["how", "are", "you?"]print(str_list[:2]) # Output: ["hey", "there!"]print(str_list[-3:]) # Output: ["how", "are", "you?"]print(str_list[:-3]) # Output: ["hey", "there!"]print(str_list[1:4]) # Output: ["there!", "how", "are"]# Get a copy of list by slicing.print(str_list[:]) # Output: ["hey", "there!", "how", "are", "you?"]

# Append to a list.numbers = [1, 2]print(numbers) # Output: [1, 2]numbers.append(3)print(numbers) # Output: [1, 2, 3]# Concatenate lists.numbers = [1, 2]strings = ["Hey", "there"]print(numbers + strings) # Output: [1, 2, "Hey", "there"]

# Mutate a list, that is, change its contents.numbers = [1, 2, 3]numbers[0] = 100print(numbers) # Output: [100, 2, 3]numbers[0:2] = [300, 400]print(numbers) # Output: [300, 400, 3]numbers[1:3] = []print(numbers) # Output: [300]numbers[:] = []print(numbers) # Output: []# Insert item to a list.greeting = ["how", "you?"]greeting.insert(1, "are")print(greeting) # Output: ["how", "are", "you?"]

# Our list of lists.matrix_1 = [[1,1,1], [2,2,2], [3,3,3]]matrix_2 = [[4,4,4], [5,5,5], [6,6,6]]# Matrix addition with for loop.# Assuming that the matrices are of the same dimensionsmatrix_sum = []for row in range(len(matrix_1)):  matrix_sum.append([])  for column in range(len(matrix[0])):      matrix_sum[row].append(matrix_1[row][column] + matrix_2[row][column])

# Our list of lists.matrix_1 = [[1,1,1], [2,2,2], [3,3,3]]matrix_2 = [[4,4,4], [5,5,5], [6,6,6]]# Rewrite using list comprehension only for inner lists.matrix_sum = []for row in range(len(matrix_1)):  matrix_sum.append([matrix_1[row][column] + matrix_2[row][column] for column in range(len(matrix[0]))])# Rewrite using nested list comprehension.matrix_sum = [[matrix_1[row][column] + matrix_2[row][column] for column in range(len(matrix[0]))]              for row in range(len(matrix_1))]print(matrix_sum) # Output: [[5, 5, 5], [7, 7, 7], [9, 9, 9]]