Set / Get value of dictionary via list of keys

Question

I would like to get and set values in a dictionary using a list of keys.

I would like to be able to use a list of keys like this

lis = ["key1", "key2", "key3"]

to effectively do something like this

dict["key1"]["key2"]["key3"] = "value"

or this

value = dict["key1"]["key2"]["key3"]