I have this string: 

```
num="['1', '9', '7', '6'],['2', '0', '8', '3', '7'],['3', '8', '5', '7', '9', '10', '4']"

```

and I want to return/output:

```
[['1', '9', '7', '6'],['2', '0', '8', '3', '7'],['3', '8', '5', '7', '9', '10', '4']]

```

how do i get to this list of lists from that huge string?