Below we sort a dictionary, then find the key with the highest value.

```python
d = {'a': 10, 'b': 20, 'c': 30}
sorted_items = sorted(d.items(), key=lambda item: item[1])
print(sorted_items[-1][0])
```
1. Get `items()` from the dictionary.
1. Pass the to `sorted` and pass a lambda to in key parameter.  This tells the sorted() function whhat to sort on.
1. Get the last entry in the sorted list of entries.
1. In this case, since we want the key for the kighest value, get the first item from the tuple in the first entiy in the sorted items.