wesm/pandas — pull request #209 by takluyver (2011-10-09 16:02:04+00:00)
Title: Series methods isnull and notnull

Fulfils enhancement #203: isnull and notnull methods for series (especially for use with columns in dataframes).

I've also slipped in a couple of other small tweaks - fixing a bug with writing series CSV, and adding trove classifiers to indicate Python 3 compatibility.