index of non “NaN” values in Pandas

Question

From Pandas data frame, how to get index of non \"NaN\" values?

My data frame is

    A    b     c
0   1    q1    1
1   2    NaN   3
2   3    q2    3
         


        

Answer 1

DataFrames have a dropna method:

import pandas
import numpy

d = pandas.DataFrame({'A': [1, 2, 3, numpy.nan], 
                      'b': [1, 2, numpy.nan, 3],
                      'c': [1, numpy.nan, 2, 3]})
d.dropna(subset=['b'])