两个变量的并集以在Pandas Data Frame中形成一个新变量-Python

Question

I have a data frame , and I want to create a new data frame based on the values of two columns. The pair of values alwyas would be: 'x' and 'x' or 'x' and NaN or NaN and 'x' or NaN and NaN . So for the first three examples the values of the new varabiel would b 'x' and for the last one would be NaN . Nan is missing value.

The pandas data frame is:

Name    Company nameC.antiguo   Company nameC.completado
 ssd         X                           X
 adf         B                          NaN
 dsf         C                           C
 eee         NaN                        NaN
 wqe         NaN                        C

I tried the following code but it doen´t work at all.

pruebaofempat['bn']= pruebaofempat['Company nameC.antiguo'] + pruebaofempat['Company nameC.completado']

So, How Can I create the new variable correctly?

Answer 1

use .fillna :

>>> df
  Name antiguo completado
0  ssd       X          X
1  adf       B        NaN
2  dsf       C          C
3  eee     NaN        NaN
4  wqe     NaN          C
>>> df['antiguo'].fillna(df['completado'])
0      X
1      B
2      C
3    NaN
4      C
Name: antiguo, dtype: object