NumPy Array Operations

NumPy is the foundation of data science in Python.

import numpy as np

arr = np.array([1, 2, 3, 4, 5])
print(arr * 2)  # [2, 4, 6, 8, 10]
print(arr.mean())  # 3.0

# Matrix operations
matrix = np.array([[1, 2], [3, 4]])
print(np.linalg.inv(matrix))  # Inverse
print(matrix.T)  # Transpose