pandas combine two columns with null values

Question

I have a df with two columns and I want to combine both columns ignoring the NaN values. The catch is that sometimes both columns have NaN values in which case I want the new co

Answer 1

• fillna both columns together
• sum(1) to add them
• replace('', np.nan)

---

df.fillna('').sum(1).replace('', np.nan)

0      apple-martini
1          apple-pie
2    strawberry-tart
3            dessert
4                NaN
dtype: object