How can I write structured data to a file and then read it back into the same structure later?

I have a rather large dict (6 GB) with a structure along the lines of:

{((('word','list'),(1,2),(1,3)),(...)):0.0, ....}

and I need to do some processing on it. I'm trying out several document clustering methods, so I need to have the whole thing in memory at once. I have other functions to run on this data, but the contents will not change.

Currently, every time I think of new functions I have to write them, and then re-generate the dict.

I want to store the dict in a file, in such a way that I can easily load it into memory later, preserving the original structure and data types, instead of recalculating all its values.

How can I do this in Python, without manually parsing dictionary etc. syntax?