TypeError: unhashable type: 'list'

```python

self._entries_cache = {}
self._entries_cache_last = []

#....

first = self._entries_cache_last.pop(0)
del self._entries_cache[first]

entries = []
directory = path_object.obj

#....
self._entries_cache[path_object.path] = entries
self._entries_cache_last.append(entries)
```
delete by value?