Excuse me, if in the Dataframe object df, existence state free values in a column, I use the np, where (df [' state ']=='NaN') carry out results for why (array ([], dtype=int64),)? Why don't show in array line index number? There are no other ways to achieve this requirement?

CodePudding user response:

 
The import pandas as pd 
The import numpy as np 

Df=pd DataFrame ({' state ': [1, 2, 3, None, 4]}) 
Print (np) where (df [' state '] isnull ())) 

Don't need to use numpy

 
The import pandas as pd 

Df=pd DataFrame ({' state ': [1, 2, 3, None, 4]}) 
Print (list (df [df [' state '] isnull ()]. The index)) 

CodePudding user response:

Thank you, ok.