numpy.swapaxes(arr, axis1, axis2)

# It creates a 3 dimensional ndarray 
import numpy as np 
a = np.arange(8).reshape(2,2,2) 

print 'The original array:' 
print a 
print '\n'  
# now swap numbers between axis 0 (along depth) and axis 2 (along width) 

print 'The array after applying the swapaxes function:' 
print np.swapaxes(a, 2, 0)

The original array:
[[[0 1]
 [2 3]]

 [[4 5]
  [6 7]]]

The array after applying the swapaxes function:
[[[0 4]
 [2 6]]

 [[1 5]
  [3 7]]]