вы можете сделать понимание списка,
lst = [np.arange(100,112).reshape(2,6),np.arange(12).reshape(2,6)]
>>>lst
[array([[100, 101, 102, 103, 104, 105],
[106, 107, 108, 109, 110, 111]]),
array([[ 0, 1, 2, 3, 4, 5],
[ 6, 7, 8, 9, 10, 11]])
]
lst = [np.delete(x, [0, 1, 2], axis=1)for x in lst]
>>>lst
[array([[103, 104, 105],
[109, 110, 111]]),
array([[ 3, 4, 5],
[ 9, 10, 11]])
]