Storing a list of objects in GAE
If it's really just a list of tuples / two "columns", could you just use an alternating list and a ListProperty?  This would be fine if the data had a consistent dimension, was small, and didn't require indexing.
e.g. To encode the example you gave in a list do:

# i forget if mixed types are allowed, but you get the idea.
["xyz", 123, "abc", 456, "hij", 678, "rer", 838]
I need to store some data that looks a little like this:

xyz 123
abc 456
hij 678
rer 838

Now I would just store it as a traditional string and integer model, and put in the datastore. But the data changes regularly, and is ONLY relevant when looked at as a COLLECTION. So it needs to be store as either a list of lists, or a list of objects, both of which can't really be done without pickling as far as I know. Can anyone help? Even storing it as a text file may work :S
Edit: I was a litle vague on details it seems.
I am sampling some data from an external source (scraping via BeautifulSoup/http2lib if it matters). This data then needs to be stored, as a whole, since it will be plotted on a graph. The data changes (but not often - perhaps once a week). Since the dataset is so simple (literally what you see above, 1 string field, and 1 integer) I figured it's easier to store them as a list of lists, then actually store them in a model. I have a feeling I have skipped over an even easier solution by concentrating too much on the fact the data needs to be stored together as one large lump.
I will be storing 500+ of these bits of data as a group, at once.