import numpy as np

if __name__ == "__main__":

arr = np.arange(10)

print(arr)

print(arr[5])

print(arr[5:8])

arr[5:8] = 12

print(arr)

arr_slice = arr[5:8]

print(arr_slice)

arr_slice[1] = 12345

print(arr)

arr_slice[:] = 64

print(arr)

arr_2d = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])

print(arr_2d[2])

print(arr_2d[0][2])

arr_3d = np.array([[[1, 2, 3], [4, 5, 6]], [[7, 8, 9], [10, 11, 12]]])

print(arr_3d)

print(arr_3d.shape)

print(arr_3d[0].shape)

old_values = arr_3d[0].copy()

arr_3d[0] = 42

print(arr_3d)

arr_3d[0] = old_values

print(arr_3d)

print(arr_3d[1, 0])

print(arr[1:6])

print(arr_2d[:2])

print(arr_2d[:2, 1:])

print(arr_2d[1, :2])

print(arr_2d[:2, 2])

print(arr_2d[:, :1])

arr_2d[:2, 1:] = 0

print(arr_2d)