I need to limit my processing of db entries to chunks of, let's say, 100. 
So I want to first get the data:

data = db(db.mytable.flag == False).select(limitby=(0,100))

for d in data:
    # do something

Then I want to set mytable.flag to True after the above loop is done, but 
only for the same 100 entries I've just retrieved.

BUT, while this is going on, someone else may be adding new entries with 
mytable.flag=False to the table. 

So without iterating one-by-one on "data", is there a one-liner to update 
mytable.flag to True for the 100 entries I already retrieved?

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