I was trying to use the product() function in Python. I know product() takes a bunch of iterables and does the Cartesian product of all of them. 

Now I put all the iterables in a list. I'm wondering how to pass all the iterables in that list at once? I can't pass in the list to product directly because then product()'ll treat it as one iterable. 
For example, I have a list of lists: 

```
[[1,2,3],['a','b']]

```

How can I pass [1,2,3] and ['a','b'] to product, so it becomes equivalent to product([1,2,3],['a','b'])? 

Thanks in advance!