Merge and sum two pandas rows based on if condition

Question

I have a huge dataframe and i want to merge only two rows in it based on if condition . Below is a sample data frame and when I tried to do groupby sum other rows are also getting effected.

I only want column jb_name with generic to get merged and sum .

    jb_name   jb_count
0   generic    10
1   generic1    2
2   generic    15
3   other      14

tried the following but as i said its effecting other rows as well

df = df.groupby(['jb_name'])['jb_count'].sum().reset_index()

I want the final df as following

    jb_name   jb_count
0   generic    25
1   generic1    2
3   other      14

Answer 1

Use:

mask = df['jb_name'] == 'generic'
df = df[mask].groupby('jb_name', as_index=False).sum().append(df[~mask], ignore_index=True)

Answer 2

Alternatively we can set the index to jb_name and use sum on level 0 where index is generic :

df = df.set_index('jb_name')
mask = (df.index == 'generic')
df1 = pd.concat([df[mask].sum(level=0), df[~mask]]).reset_index()

Result:

# print(df1)

    jb_name  jb_count
0   generic        25
1  generic1         2
2     other        14

Answer 3

#Bollean select, droupby as you sum the duplicated and append tthe no duplicates

m=df.jb_name=='generic'
df[m].groupby(by='jb_name', axis=0).sum().reset_index().append(df[~m])



jb_name  jb_count
0   generic        25
1  generic1         2
3     other        14