列出一系列缺失行的唯一标识符

Question

Is it possible to return the row number of missing values within a given series?

    Name  Age
    Fred  25
    John  38
    Chris

I want to return the row number or some unique identifier of any rows where 'Age' is missing. ie Chris

Answer 1

Use:

df = pd.DataFrame({'Age': [25.0, 38.0, np.nan]}, index=['Fred', 'John', 'Chris'])
print (df)
        Age
Fred   25.0
John   38.0
Chris   NaN

m = df['Age'].isnull()
print (df.index[m].tolist())
[Chris]

Answer 2

您可以执行df.index[pd.isnull(df['Age'])]