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NumPy Cheat Sheet
Print-ready cheat sheet for NumPy, organized for fast lookup, study, and desk-side use
Sample
What's in this cheat sheet
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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
a.shape | Dimensions as tuple: `(3, 4)` |
a.ndim | Number of dimensions |
a.size | Total number of elements |
a.dtype | Data type: `float64`, `int32`, etc. |
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