Is there a way to combine these strings then make each comma value a row?

Question

The problem im up against at the moment is the need to take a data frame that looks like this

Column 1            Column 2 
"A"                 "B,C,D,E"
"T"                 "X,R,S"

and to make it look more like this

Column 1
"A"
"B"
"C"
"D"
...

I am trying to do this using Pandas, but I haven't found a way to reliably get the values into that same column.

do you have just two columns, and you want one of them to explode into the first one? Values separated by a comma turned into rows? — Mahrkeenerh, Nov 04 '21 at 16:44

score 1 · Accepted Answer · answered Nov 04 '21 at 16:49

1

Try with stack and explode:

output = df.stack().droplevel(1).str.split(",").explode().reset_index(drop=True)

>>> output
0    A
1    B
2    C
3    D
4    E
5    T
6    X
7    R
8    S

answered Nov 04 '21 at 16:49

not_speshal

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score 1 · Answer 2 · answered Nov 04 '21 at 16:59

You can join, split and explode:

df = pd.DataFrame({'col1':['A', 'T'], 'col2':['B,C,D,E', 'X,R,S']})
df.apply(','.join, axis=1).str.split(',').explode(ignore_index=True)

Output:

0    A
1    B
2    C
3    D
4    E
5    T
6    X
7    R
8    S
dtype: object

Is there a way to combine these strings then make each comma value a row?

2 Answers2