data2d = [ [1.0, 2.0, 3.0, 4.0, 5.0],  [2.0, 3.0, 4.0, 5.0, 6.0, ],  [3.0, 4.0, 5.0, 6.0, 7.0]]

#Creating a 2D data FLOAT dataset adding lines one by one
path = "group/data1"
create_dataset(path, 'd', False, (0,0))
for row in data2d:
    append_dataset(path, row)    


#Creating a Table (compund type)
path = "group/data2"
names = ["a", "b", "c",]
types = ["d", "d", "d",]

table = [    [1,2,3],  
            [2,3,4],  
            [3,4,5,]    ]

create_table(path, names, types)
for row in table:
    append_table(path, row)   

set_attribute("group/data2", "att", 2)