基礎介紹：

numpy.delete

numpy.delete(arr, obj, axis=None)[source]

    Return a new array with sub-arrays along an axis deleted. For a one dimensional array, this returns those entries not returned by arr[obj].
    Parameters:	

    arr : array_like

        Input array.

    obj : slice, int or array of ints

        Indicate which sub-arrays to remove.

    axis : int, optional

        The axis along which to delete the subarray defined by obj. If axis is None, obj is applied to the flattened array.

    Returns:	

    out : ndarray

        A copy of arr with the elements specified by obj removed. Note that delete does not occur in-place. If axis is None, out is a flattened array.
 

1.刪除一列

>>> dataset=[[1,2,3],[2,3,4],[4,5,6]]
>>> import numpy as np
>>> dataset = np.delete(dataset, -1, axis=1)
>>> dataset
array([[1, 2],
       [2, 3],
       [4, 5]])

arr = np.array([[1,2,3,4], [5,6,7,8], [9,10,11,12]])
np.delete(arr, [1,2], axis=1)
array([[ 1,  4],
       [ 5,  8],
       [ 9, 12]])