>>> x12 = np.array([[1,2,3]])

>>> print(x12)

[[1 2 3]]

>>> x12.ndim

2

>>>

   Tried creating a 2-D array.

also,

>>> x12 = np.array([[1,2,3],[0,0,0]])
>>> print(x12)
[[1 2 3]
 [0 0 0]]
>>> x12.ndim
2
>>>

Case 2:

>>>

>>> x12 = np.array([[1,2,3],[]])

>>> x12.ndim

1

>>> print(x12)

[list([1, 2, 3]) list([])]

>>>

   In case 2, I am trying to understand why it becomes 1 dimentional ?!?!

Case 3:

>>>

>>> x12 = np.array([1,2,3])

>>> x12.ndim

1

>>> print(x12)

[1 2 3]

>>>