Rank of array data type
output = H5T.get_array_ndims(type_id)
output = H5T.get_array_ndims(type_id) returns
the rank, the number of dimensions, of an array data type object.
fid = H5F.open('example.h5'); dset_id = H5D.open(fid,'/g3/array2D'); type_id = H5D.get_type(dset_id); ndims = H5T.get_array_ndims(type_id);