Expand pandas DataFrame column into multiple rows

Question

If I have a DataFrame such that:

pd.DataFrame( {\"name\" : \"John\", 
               \"days\" : [[1, 3, 5, 7]]
              })

<

Answer 1

New since pandas 0.25 you can use the function explode()

https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.explode.html

import pandas as pd
df = pd.DataFrame( {"name" : "John", 
               "days" : [[1, 3, 5, 7]]})

print(df.explode('days'))

prints

   name days
0  John    1
0  John    3
0  John    5
0  John    7