numpy.delete

此函数返回一个新数组，其中从输入数组中删除了指定的子数组。与insert()函数一样，如果未使用axis参数，则输入数组将被展平。该功能采用以下参数

Numpy.delete(arr, obj, axis)

这里

序号	参数和描述
1	arr 输入数组
2	obj 可以是切片，整数或整数数组，指示要从输入数组中删除的子数组
3	axis 用于删除给定子阵列的轴。如果没有给出，arr就会变平

例

import numpy as np
a = np.arange(12).reshape(3,4)

print 'First array:'
print a
print '\n'  

print 'Array flattened before delete operation as axis not used:'
print np.delete(a,5)
print '\n'  

print 'Column 2 deleted:'  
print np.delete(a,1,axis = 1)
print '\n'  

print 'A slice containing alternate values from array deleted:'
a = np.array([1,2,3,4,5,6,7,8,9,10])
print np.delete(a, np.s_[::2])

其输出如下

First array:
[[ 0 1 2 3]
 [ 4 5 6 7]
 [ 8 9 10 11]]

Array flattened before delete operation as axis not used:
[ 0 1 2 3 4 6 7 8 9 10 11]

Column 2 deleted:
[[ 0 2 3]
 [ 4 6 7]
 [ 8 10 11]]

A slice containing alternate values from array deleted:
[ 2 4 6 8 10]