I'm working on an app which involves analysis of numpy arrays. I intend for 
the arrays to be stored in files in the user's dropbox (and the app links 
to dropbox), so as not to clutter my app's storage with hundreds of 
(possibly large) files. When a user selects a file, the data is read and 
then plotted using matplotlib. I need to save the data array somewhere, so 
that the plot can be updated with the various processes that the user 
initiates, which take place in a module.

What's a good way to store the data so that the module can access it? I 
don't really want to drop it in a db, since the whole point is to keep the 
permanent datastore in the user's dropbox. I also don't want to re-access 
the file every time I need to alter the plot...

I suppose the same question could to the plot object itself instead, though 
I could rebuild the plot easily from the stored data more easily than 
reading from the dropbox file every time.

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