按列值分组数据

Question

Hi I have data (in excel and text file as well) like

C1   C2    C3
 1    p     a
 1    q     b
 2    r     c
 2    s     d

And I want the output like:

C1   C2   C3
 1   p,q  a,b
 2   r,s  c,d

How can I group the data based on column values. I am open to anything: any library, any language, any tool Like python, bash, or even excel?

I think we can do this using pandas in python, but I havent used it before.

Any leads appreciated.

Answer 1

First pandas.read_excel - output is DataFrame :

df = pd.read_excel('file.xlsx')

Then you can use groupby with agg join :

df = df.groupby('C1').agg(','.join).reset_index()
print (df)
   C1   C2   C3
0   1  p,q  a,b
1   2  r,s  c,d

If more columns in df and need filter only C2 and C3 :

df = df.groupby('C1')['C2','C3'].agg(','.join).reset_index()
print (df)
   C1   C2   C3
0   1  p,q  a,b
1   2  r,s  c,d

For save to excel file use DataFrame.to_excel , obviously without index :

df.to_excel('file.xlsx', index=False)