numpy怎么删除列

以下是两种使用numpy删除列的方法：

1. 删除一列

import numpy as np

dataset = np.array([[1,2,3],[2,3,4],[4,5,6]])
dataset = np.delete(dataset, -1, axis=1)
print(dataset)
# 输出：array([[1, 2],
#            [2, 3],
#            [4, 5]])

2. 删除多列

import numpy as np

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