`numpy:atleast_3d`

Signature

def atleast_3d ( * arys )

View inputs as arrays with at least three dimensions.

arys1, arys2, ... : array_like: One or more array-like sequences. Non-array inputs are converted to arrays. Arrays that already have three or more dimensions are preserved.

res1, res2, ... : ndarray: An array, or tuple of arrays, each with a.ndim >= 3. Copies are avoided where possible, and views with three or more dimensions are returned. For example, a 1-D array of shape (N,) becomes a view of shape (1, N, 1), and a 2-D array of shape (M, N) becomes a view of shape (M, N, 1).

import numpy as np
np.atleast_3d(3.0)

✓

x = np.arange(3.0)
np.atleast_3d(x).shape

✓

x = np.arange(12.0).reshape(4,3)
np.atleast_3d(x).shape
np.atleast_3d(x).base is x.base  # x is a reshape, so not base itself