>>> import allocarr 
>>> print allocarr.mod.__doc__
b - 'f'-array(-1,-1), not allocated
foo - Function signature:
  foo()

>>> allocarr.mod.foo()  
 b is not allocated
>>> allocarr.mod.b = [[1,2,3],[4,5,6]]         # allocate/initialize b
>>> allocarr.mod.foo()
 b=[
   1.000000       2.000000       3.000000    
   4.000000       5.000000       6.000000    
 ]
>>> allocarr.mod.b                             # b is Fortran-contiguous
array([[ 1.,  2.,  3.],
       [ 4.,  5.,  6.]],'f')
>>> allocarr.mod.b = [[1,2,3],[4,5,6],[7,8,9]] # reallocate/initialize b
>>> allocarr.mod.foo()
 b=[
   1.000000       2.000000       3.000000    
   4.000000       5.000000       6.000000    
   7.000000       8.000000       9.000000    
 ]
>>> allocarr.mod.b = None                      # deallocate array
>>> allocarr.mod.foo()
 b is not allocated