numpy repeat

numpy.repeat(a, repeats, axis=None)

import numpy as np

arr = np.array([1, 2, 3, 4, 5])
repeated_arr = np.repeat(arr, 3)

print(repeated_arr)

[1 1 1 2 2 2 3 3 3 4 4 4 5 5 5]

import numpy as np

arr = np.array([[1, 2], [3, 4]])
repeated_arr = np.repeat(arr, 2, axis=0)

print(repeated_arr)

[[1 2]
 [1 2]
 [3 4]
 [3 4]]

import numpy as np

arr = np.array([[1, 2], [3, 4]])
repeated_arr = np.repeat(arr, 2, axis=1)

print(repeated_arr)

[[1 1 2 2]
 [3 3 4 4]]