Arrays

numpy works with arrays — grids of numbers of the same type. Its superpower: an operation applies to every element at once, no loops needed.

import numpy as np

a = np.array([1, 2, 3])
print(a * 10)        # [10 20 30]
print(a + a)         # [2 4 6]
print(a.min(), a.max(), a.mean())

The first run downloads numpy — it takes a few seconds.