Converting each row into a dataframe and concatenate results

I have a dataframe df in the format below, where content is a string column.

                                                               content
0  {'api': ['api_1', 'api_1', 'api_1'],'A': [1,2,3], 'B': [4,5,6] }
1  {'api': ['api_2', 'api_2', 'api_2'],'A': [7,8,9], 'B': [10,11,12] }

and I want to convert it to the format:

     api  A   B
0  api_1  1  4
1  api_1  2  5
2  api_1  3  6
3  api_2  7  10
4  api_2  8  11
5  api_2  9  12

I tried doing this,

pd.concat([pd.DataFrame(eval(row['content'])) for (rownum, row) in df.iterrows()])

which works, but it doesn’t look nice. Is there any better way to do this?

Answer

Let us try

out = pd.concat(pd.DataFrame(x) for x in df.content.map(literal_eval))
     api  A   B
0  api_1  1   4
1  api_1  2   5
2  api_1  3   6
0  api_2  7  10
1  api_2  8  11
2  api_2  9  12