import numpy as np

1D array

# 1D array
a = np.array([1, 2, 3])
a

array([1, 2, 3])

a.shape

(3,)

2D array

# 2D array
b = np.array([(1.5, 2, 3), (4, 5, 6)])
b

array([[1.5, 2. , 3. ],
       [4. , 5. , 6. ]])

b.shape

(2, 3)

3D array

c = np.array([
    [(1.5, 2, 3), (4, 5, 6)],
    [(3, 2, 1), (4, 5, 6)]
])
c

array([[[1.5, 2. , 3. ],
        [4. , 5. , 6. ]],

       [[3. , 2. , 1. ],
        [4. , 5. , 6. ]]])

c.shape

(2, 2, 3)