Python - Unnest cells in Pandas DataFrame

Question

Suppose I have DataFrame df:

a b c
v f 3|4|5
v 2 6
v f 4|5

I\'d like to produce this df:

<         


        

Answer 1

You could:

import numpy as np

df = df.set_index(['a', 'b'])
df = df.astype(str) + '| ' # There's a space ' ' to match the replace later
df = df.c.str.split('|', expand=True).stack().reset_index(-1, drop=True).replace(' ', np.nan).dropna().reset_index() # and replace also has a space ' '

to get:

   a  b  0
0  v  f  3
1  v  f  4
2  v  f  5
3  v  2  6
4  v  f  4
5  v  f  5