http://pandas.pydata.org/pandas-docs/stable/gotchas.html should note that DataFrame objects are not threadsafe
http://pandas.pydata.org/pandas-docs/stable/gotchas.html should note that DataFrame objects are not threadsafe: http://stackoverflow.com/questions/13592618/python-pandas-dataframe-thread-safe

(as of 0.7.3, they still are not threadsafe afaict)
