complete the python code that will print the cube of the numbers defined in the groups variable.

$1$ cube is $1$

$2$ cube is $8$

$3$ cube is $27$

$4$ cube is $64$

$5$ cube is $125$

$6$ cube is $216$

$7$ cube is $343$

$8$ cube is $512$

$9$ cube is $729$