It seems like you want to do that:
dict.keys()[-1]
dict.keys() returns a list of your dictionary’s keys. Once you got the list, the -1 index allows you getting the last element of a list.
Since a dictionary is unordered*, it’s doesn’t make sense to get the last key of your dictionary.
Perhaps you want to sort them before. It would look like that:
sorted(dict.keys())[-1]
Note:
In Python 3, the code is
list(dict)[-1]
*Update:
This is no longer the case. Dictionary keys are officially ordered as of Python 3.7 (and unofficially in 3.6).