How to drop rows of Pandas DataFrame whose value in a certain column is NaN

Question

I have this DataFrame and want only the records whose EPS column is not NaN:

>>> df
                 STK_ID           


        

Answer 1

yet another solution which uses the fact that np.nan != np.nan:

In [149]: df.query("EPS == EPS")
Out[149]:
                 STK_ID  EPS  cash
STK_ID RPT_Date
600016 20111231  600016  4.3   NaN
601939 20111231  601939  2.5   NaN