> The data was sorted and so duplicates will not appear anywhere in the dataframe. >
I guess that's it. Use the standard csv module and itertools.groupby. Groupby will produce a list of grouped objects. So you can group by the first column by supplying a key function which just returns the first column. Check this out for an example: http://stackoverflow.com/questions/773/how-do-i-use-pythons-itertools-groupby(most upvoted answer)
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