import numpy as np

a = np.array( [ [3,4], [2, 7], [1, 5], [2, 6] ] )
b = np.rot90(a)
c = np.lexsort( b )
d = a[c]

print( 'a = ', a , sep='\n' )
print( "-"*50  )
print( 'b = np.rot90(a) ', b , sep='\n' )
print( "-"*50  )
print( 'c = np.lexsort( b ) ', c , )
print( "-"*50  )
print( 'a[c] = ', d , sep='\n' )