slice numpy

import numpy as np

A = np.array(range(3))

B = A[:2]
print(A, B)

B[0] = 9
print(A, B)

A[0] = 5
print(A, B)

# [0 1 2] [0 1]
# [9 1 2] [9 1]
# [5 1 2] [5 1]