How to split/expand a string value into several pandas DataFrame rows?

Question

Let\'s say my DataFrame df is created like this:

df = pd.DataFrame({\"title\" : [\"Robin Hood\", \"Madagaskar\"],
                  \"genres\" :         


        

Answer 1

Since pandas >= 0.25.0 we have a native method for this called explode.

This method unnests each element in a list to a new row and repeats the other columns.

So first we have to call Series.str.split on our string value to split the string to list of elements.

>>> df.assign(genres=df['genres'].str.split(', ')).explode('genres')

        title     genres
0  Robin Hood     Action
0  Robin Hood  Adventure
1  Madagaskar     Family
1  Madagaskar  Animation
1  Madagaskar     Comedy