Pandas dataframe。 错误的系列飞线

Question

I want to have 81 rows x 1 columns. How to correct this distortion?

Answer 1

Use fillna . Basically, use the values in the second column to fill holes in the first column:

df['first_column'].fillna(df['second_column'])

For example, if you have DataFrame df :

     a      b
0  1.0    NaN
1  2.0    NaN
2  NaN  100.0

then

df['a'] =  df['a'].fillna(df['b'])
df = df.drop(columns=['b'])

Output:

       a
0    1.0
1    2.0
2  100.0