I have a pandas dataframe of 3 columns by 5 rows. I would like to make it be one column of 15 rows by putting the second column below the first, and the third below the second. Something like:
[1,2,3,
4,5,6,
7,8,9,
10,11,12,
13,14,15]
would turn into:
[1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
13,
14,
15]
Is there a cleaner, quicker way to do this than calling df.append multiple times? In reality I will have to do this for dozens of columns, not just three.
