looking for a multi item container

[Skaperen]

this would be quite easy to implement; perhaps easier than the effort to find an existing one (since i am not very good at the latter), perhaps already in Python under some name not obvious to me. what i need soon is a mapping which lets me insert duplicate entries under the same key and maintains order of insertion within the same key. it also needs to be able to provide items in that order after a search for that key as opposed just doing so via an iteration from the beginning. IoW, it needs to be able to move the current position forward or backward based on a given key being searched.