Numpy append 3D vectors without flattening [duplicate]

Answer 1

For visual simplicity let's rename video_132 --> a, and video_146[1][146][45] --> b. The particular values aren't important so let's say

In [82]: a = np.zeros((64, 3))
In [83]: b = np.ones((3,))

Then we can append b to a using:

In [84]: np.concatenate([a, b[None, :]]).shape
Out[84]: (65, 3)

Since np.concatenate returns a new array, reassign its return value to a to "append" b to a:

a = np.concatenate([a, b[None, :]])