Welcome to my fridge door!

import numpy as np
arr = np.array([1, 2, 3, 4])
print(arr * 2)

[2 4 6 8]

>>
vs regular py:

lst = [1, 2, 3, 4]
print(lst * 2)
# Output: [1, 2, 3, 4, 1, 2, 3, 4] <-- list repetition!