Sure thing! Here is Python code that will append two lists.

```
list1 = [1, 2, 3]
list2 = [4, 5, 6]

list1.extend(list2)
print(list1)
```

The above code uses the .extend() method to append two lists together. The first list, list1, is assigned the values 1, 2, and 3. The second list, list2, is assigned the values 4, 5, and 6. The .extend() method takes the elements of list2 and adds them to the end of list1. The result is a single list, list1, containing the values 1, 2, 3, 4, 5, and 6. The print() function is used to display the resulting list.
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