在pandas / python中的数据框中合并两行文本“带有换行”

Question

Combine two columns of text in dataframe in pandas/python

So I am trying to change a line with the solution given at the answer above.

For example,

   Year     quarter period
0  2014    q1     2014q1
1  2015    q2     2015q2

what I'd like to see in my 'period' column is not 2014q1
but

2014   
 q1

q1 at the bottm of 2014

I wish I could put the content of one column below the content of the different column when two contents of different columns are combined.

I have tried

dataframe["period"] = dataframe["Year"].map(str) +'\n' + dataframe["quarter"]

but it doesn't work. The code above gives me

 2014 \n q1

Any advice?

Answer 1

Use DataFrame.stack() :

df = pd.DataFrame({'Year': [2014,2015], 'period': ['q1','q2']})
df.stack()

It gives you:

0  Year      2014
   period      q1
1  Year      2015
   period      q2

The first (index) column does not explicitly print 0 in the second row and 1 in the last row, but those are implied. It has the same meaning as:

0  Year      2014
0  period      q1
1  Year      2015
1  period      q2