NumPy Cheat Sheet

From Lists

import numpy as np
a = np.array([1, 2, 3])        # 1D
b = np.array([[1, 2], [3, 4]])  # 2D

Built-in Constructors

np.zeros((2, 3))     # 2x3 of zeros
np.ones((3, 3))      # 3x3 of ones
np.eye(4)            # 4x4 identity matrix
np.arange(0, 10, 2)  # [0, 2, 4, 6, 8]
np.linspace(0, 1, 5) # 5 evenly spaced

Array Properties