Use a nested list
`matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]`
Create an empty matrix with loops
`matrix = []`
`for i in range(3):`
` row = []`
` for j in range(3):`
` row.append(0)`
` matrix.append(row)`
Use list comprehension
`matrix = [[0 for _ in range(3)] for _ in range(3)]`
Use NumPy
`import numpy as np`
`matrix = np.array([[1, 2], [3, 4]])`
Create an identity matrix with NumPy
`identity = np.eye(3)`
Create a matrix of zeros with NumPy
`zeros = np.zeros((3, 3))`
Create a matrix of ones with NumPy
`ones = np.ones((3, 3))`