inserting an empty line in between every two elements a column (data frame + pandas) - pandas

Question

My data frame looks something like this:
Games
0 CAR 20
1 DEN 21
2 TB 31
3 ATL 24
4 SD 27
5 KC 33
6 CIN 23
7 NYJ 22
import pandas as pd
df =pd.read_csv('weekone.txt',)
df.columns=['Games']
I'm trying to put a blank line in between every two elements (teams).
So I want it to look like this:
Games
0 CAR 20
1 DEN 21
2 TB 31
3 ATL 24
4 SD 27
5 KC 33
6 CIN 23
7 NYJ 22
But when I'm using this loop
for i in df2.index:
if (df2.index[i])%2 == 1:
df2.Games[i]=df2.Games[i]+('\n')
else:
df2.Games[i] = df2.Games[i]
I'm getting an output like this:
Games
0 CAR 20
1 DEN 21\n
2 TB 31
3 ATL 24\n
4 SD 27
5 KC 33\n
6 CIN 23
7 NYJ 22\n
What am I doing wrong? Thanks.

Answer 1

you can do it this way:
In [172]: x
Out[172]:
Games
0 CAR 20
1 DEN 21
2 TB 31
3 ATL 24
4 SD 27
5 KC 33
6 CIN 23
7 NYJ 22
In [173]: %paste
empty_line = pd.DataFrame([''], columns=x.columns, index=[''])
rslt = x.loc[:1]
g = x.groupby(x.index//2)
for i in range(1, len(g)):
rslt = pd.concat([rslt.append(empty_line), g.get_group(i)])
## -- End pasted text --
In [174]: rslt
Out[174]:
Games
0 CAR 20
1 DEN 21
2 TB 31
3 ATL 24
4 SD 27
5 KC 33
6 CIN 23
7 NYJ 22
the index's dtype is object now:
In [178]: rslt.index.dtype
Out[178]: dtype('O')
or having -1 as an index for empty lines:
In [175]: %paste
empty_line = pd.DataFrame([''], columns=x.columns, index=[-1])
rslt = x.loc[:1]
g = x.groupby(x.index//2)
for i in range(1, len(g)):
rslt = pd.concat([rslt.append(empty_line), g.get_group(i)])
## -- End pasted text --
In [176]: rslt
Out[176]:
Games
0 CAR 20
1 DEN 21
-1
2 TB 31
3 ATL 24
-1
4 SD 27
5 KC 33
-1
6 CIN 23
7 NYJ 22
index dtype:
In [181]: rslt.index.dtype
Out[181]: dtype('int64')