Python中的 numpy.rot90()

numpy.rot90()方法在轴（0 或 1）指定的平面上将数组旋转 90 度。
句法：

numpy.rot90(array, k = 1, axes = (0, 1))

参数 ：

array : [array_like]i.e. array having two or more dimensions.
k     : [optional , int]No. of times we wish to rotate array by 90 degrees.
axes  : [array_like]Plane, along which we wish to rotate array.

返回：

rotated copy of array

# Python Program illustrating
# numpy.rot90() method
  
import numpy as geek
  
array = geek.arange(12).reshape(3, 4)
print("Original array : \n", array)
  
# Rotating array 4 times : Returns same original array
print("\nArray being rotated 4 times : \n", geek.rot90(array, 4))
  
# Rotating once
print("\nRotated array : \n", geek.rot90(array))
  
# Rotating twice
print("\nRotated array : \n", geek.rot90(array, 2))

输出 ：

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

Array being rotated 4 times : 
 [[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]]

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

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

参考 ：
https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.rot90.html